ࡱ>    bjbjT~T~ 4666Yd d     d ?@c~]???????$@tC7?&"&&7?]3L?~:~:~:& 8]?~:&?~:~:<E=|P]_ ,2=>b?0?=,D6DE=E=DY=!l~:#$@$f7?7?9?&&&&Dd m: Evolution exam questions CHAPTER 1. True / False 1. Which of the following best describes the evolutionary rationale behind Highly Active Anti-Retroviral Therapy (HAART)? ____With multiple drugs, more mutations must be present in a virion's genome for that virion to be resistant. The more mutations that must be present, the less likely they are to occur together in the proper combination. ____Each drug targets a different phase of the virion's life cycle, so HAART kills more virions more effectively than do single drugs acting alone. ____HAART enhances the resistance of CD4 cells to invasion by HIV virions. ____ HAART prevents the establishment of a reservoir of viable HIV virions in the body. 2. Which of the following contributes to the development of AZT resistance in HIV virions? ____ In individuals using AZT, virions with mutations that make them better than others at distinguishing AZT from thymine replicate better than do others. ____ Reverse transcriptase has no "proof-reading" ability -- mistakes during reverse transcription are preserved as mutations. ____Reverse transcriptase makes mistakes while producing viral DNA from viral RNA. ____Some mutant forms of reverse transcriptase are better than others at distinguishing AZT from thymine. 3. The evolution of X4 virions is an example of which of the following choices? ____ "Short-sighted" evolution that hastens the death of the host and all the HIV virions inside the host. ____ Evolution for increased transmission to new hosts. ____ Evolution for "the good of the species" (the species being HIV). ____ Evolution toward milder virulence, to ensure prolonged survival of the host 4. In the figure below, why did the black line become nearly horizontal after year 6?  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/objects/3929/4023729/img/01_q12.jpg" \* MERGEFORMATINET  ____ The HIV population stopped growing in size. ____ When T cells declined to a low number there was no longer differential survival ____ The HIV population ceased evolving. ____ The HIV population reached the maximum fitness. 5. This diagram represents the phylogeny (evolutionary history) of the HIV virus and its non-human primate relatives. Correctly match each label with its description.  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/tmp/labeling/4963048_dyn.jpg" \* MERGEFORMATINET  LabelYour AnswerCorrect AnswerThis node represents the common ancestor of one group of human HIV-1 viruses and their closest chimpanzee SIV relatives.  C. This node represents the common ancestor of a group of SIV viruses that have not been transmitted to humans. B. This node represents the common ancestor of all human HIV viruses and all of their non-human primate relatives.  A. This node represents the common ancestor of all human HIV-1 lineages and their chimpanzee SIV relatives.  D.  6. Evidence that transmission of HIV from an SIV relative in chimpanzees to humans has taken place multiple times includes the finding that ______________. ___ Each of three human HIV subgroups is most closely related to a different chimp SIV strain. ____The transmission of group M HIV strains probably occurred around the 1930s. ____HIV is highly variable within individuals over the course of an infection. ____ HIV-2 is another form of HIV that is derived the same primate species as HIV-1 7. What surprising thing do bird embryos' feet and wings do during development? What is the significance for evolutionary theory? Answer: bird embryos develop a fourth finger in the hand, and a fifth toe in the feet, which later vanish during development. This is a vestigial developmental structure, and is evidence for common descent; it indicates that birds are descended from ancestors that had more fingers and toes than today's birds. 8. Which of the following best describes vestigial structures? a. Vestigial structures are similar structurally and functionally to comparable structures in other organisms. b. Vestigial structures are small structures that are not present in close relatives. c. Vestigial structures have not yet been identified in humans. d. Vestigial structures are well-developed structures that have a different function in close relatives. e. Vestigial structures are functionless or rudimentary homologs of characters that are functional in close relatives. Answer: Vestigial structures are functionless or rudimentary homologs of characters that are functional in close relatives. 9. Give the term or phrase described by each sentence. Option Your answerCorrect Answer A. Radiometric datingThe total of all known fossils that have been described scientifically. E. Fossil record B. Ring speciesA rudimentary, functionless remnant of a trait that is better developed and functional in close relatives. F. Vestigial trait C. Law of successionThe tendency of fossils, or living animals, to closely resemble earlier fossils from the same area. C. Law of succession D. Transitional fossilA fossil species that combines traits of two different lineages that are thought to be related. D. Transitional fossil E. Fossil recordA species that is spread over a large geographic area in a circular distribution, the endmost populations of which come into contact with each other but do not interbreed. B. Ring species F. Vestigial traitEstimation of the age of a volcanic rock using parent/daughter ratios of certain radioactive elements.  .. A. Radiometric dating  10. Which is the best definition of Darwinian fitness? a. The ability of a population to survive in any environment, compared to other populations. b. The ability of an individual to survive and reproduce in any potential environment, compared to other individuals of that population. c. The ability of a species to survive in a certain environment, compared to other species. d. The ability of a species to survive over time, compared to other species.  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1000/style_images/pixel.gif" \* MERGEFORMATINET  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1000/style_images/pixel.gif" \* MERGEFORMATINET 11. When selection acts on traits with heritable variation, the effects on a population will be a. a change in its relative fitness. b. to increase the mutation rate. c. a change in the frequency of phenotypes (and alleles) over time. d. all of the above. 12.  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1000/style_images/pixel.gif" \* MERGEFORMATINET The evolution of new traits is possible because: a. selection can anticipate future environmental changes. b. mutation and recombination during sexual reproduction produce new genotypes. c. selection can act on the expression of existing traits in new tissue/organs or at new developmental periods leading to novel functions. d. The last two are both reasons why selection can lead to new traits. 13. Which of the following statements is true? a. Natural selection can never be progressive because of its random nature. b. Natural selection usually results in an immediate increase in population variation. c. Natural selection acts on populations, but its consequences occur in individuals. d. Natural selection leads to perfection of existing traits. e. Natural selection acts directly on phenotypes, and only indirectly on genotypes. 14. Which of the following is a true statement regarding preadaptations? a. A trait that is imperfect due to genetic or developmental constraints. b. A trait that evolved accidentally (usually due to genetic drift) and has no function. c. A trait that evolved for one function, but that coincidentally is also suited for a new, different function. e. A trait that is in the initial stages of evolving for a certain function, but has not yet been perfected. 15. The creationist "argument from design" is based on the idea that complex structures and organisms can't arise by chance. The argument fails because, although _________ is random, ___________ is not; it is directed in the sense of increasing adaptation. a. evolution/selection b. mutation/selection c. selection/mutation d. adaptation/mutation 16. Match each characteristic of Jones' and Reithel's snapdragons with its correct counterpart among Darwin's postulates. PostulateCharacteristicYour Answer A. variation is heritable3/4 of the snapdragons had almost pure white flowers; 1/4 of the plants had yellow flowers. B. organisms varyFlower color is determined by a gene with two alleles; SS and Ss individuals are white; ss individuals are yellow. C. reproduction is nonrandom; organisms with favorable traits survive and reproduce better than othersPlants varied in the number of pollinator visits and seeds produced. D. some individuals are more successful and surviving and reproducing than othersWhite flowers attracted twice as many bee visits as yellow flowers.  17. Although the scientific community rapidly accepted that all organisms are related by descent, Darwin's mechanism for change over time -- natural selection -- wasn't fully accepted until nearly 100 years after the publication of The Origin. Which of the following explain(s) why? a. Darwin didn't know how variation was created or maintained in natural populations. b. Lord Kelvin, a famous physicist, published an analysis (that turned out to be badly flawed) that set the age of the Earth at no more than 20 million years. c. Darwin didn't know how variation was passed from parent to offspring; he couldn't counter arguments that blending inheritance would prevent selection from preserving favorable variation. d. All of the above are reasons why natural selection wasn't widely accepted during Darwin's lifetime. 18. Match the term in Column 1 with description in Column 2. Option DescriptionYour Answer Correct Answer A. paraphyletic groupA group that contains an ancestor and all of its descendants H. monophlyetic group, or clade B. homoplasyA group that contains an ancestor and some, but not all, of its descendants A. paraphyletic group C. outgroupThe occurrence of shared traits that were inherited from a common ancestor D. homology D. homologyThe occurrence of shared traits that were not inherited from a common ancestor B. homoplasy E. derivedModified from an ancestral state to a new state E. derived F. synapomorphyA shared trait that was modified (changed from an older ancestral state) in the most recent common ancestor F. synapomorphy G. reversal A close relative of the groups under study, but one that is known to have branched off earlier than all the other groups C. outgroup H. monophlyetic group, or cladeA change of a modified trait back to its ancestral state G. reversal  19. Is the genetic code a homologous trait for the clade of birds? Is the genetic code a synapomorphy for the clade of birds? Explain. The genetic code is homologous among birds, but is not a synapomorphy, because it was not changed from the ancestral state in the last common ancestor of birds. Instead, this trait was inherited unchanged from the last common ancestor of all living organisms, and is shared with all other taxa of living organisms. 20. When we say that the genetic code is redundant, we are referring to the fact that ___________. a. some genes affect more than one trait b. some amino acids are coded for by more than one codon c. some codons code for more than one amino acid d. humans have more DNA than is ever transcribed and translated some genes have multiple alleles 21. Which of the following statements is true? a. Mutation rate is identical for all species, on a per-cell, per-generation basis. b. High mutation rates are advantageous in novel environments. c. Faster DNA polymerases are associated with lower mutation rate. d. Mutation rate is usually higher for nuclear DNA than for mitochondrial DNA. e. Lower mutation rates are better than higher mutation rates. 22. In the studies by Denver et al. of the fitness effects of mutations on Caenorhabditis elegans, individuals in the control populations had higher fitness than did those in experimental populations. Which of the following is the best explanation for this result? a. Control populations were maintained in normal conditions of laboratory culture, competing for the resources needed to survive and reproduce, whereas experimental populations were kept under more benign conditions. Selection therefore acted more strongly on individuals in the control population and eliminated deleterious alleles more rapidly than it did from the experimental populations. b. Experimental populations experienced higher mutation rates than did control populations. Therefore, they would have accumulated deleterious alleles at a higher rate than did the control populations. c. Experimental populations were kept under much harsher conditions than were control populations, reducing individual fitness because selection was acting very strongly. d. Control populations experienced a higher frequency of favorable mutations while the experimental populations experienced a higher frequency of deleterious mutations. 23. An important source of new genes is probably ___________ the underlying mechanism for this is ___________. a. polyploidy/duplication of the genome b. gene duplication/unequal crossing over c. genetic linkage/chromosome inversions d. point mutations/errors during DNA replication e. a and b f. c and d 24. Evidence that the human hemoglobin gene family evolved via gene duplication includes: a. correspondence in the length and positions of exons and introns among globin genes. b. similarity in function among the globin genes. c. the presence of pseudogenes -- nonfunctional loci that are structurally similar to the functional loci. d. high sequence similarity among globin genes. e. All of the above are evidence that the globin gene family evolved by gene duplication. 25. The most important EVOLUTIONARY consequence of chromosomal inversions is: a. they prevent selection from acting on the alleles within the inverted region, thereby increasing genetic diversity. b. they prevent specific groups of alleles from being separated by crossing-over, allowing them to be inherited together as single "supergenes." c. mutation rates are higher in chromosomal inversions d. they increase the rate of point mutations in the alleles within the inversion. 26. Which of the following statements regarding polyploidy, or genome duplication, is false? a. It has not been a major feature of vertebrate evolution. b. It tends to produce species with even numbers of chromosomes. c. It can lead to immediate speciation. d. It is more likely in organisms that can self-fertilize. e. It is more common in plants than animals. 27. Match each terms relating to mutational processes listed below with the best statement.  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/dot.gif" \* MERGEFORMATINET OptionYour AnswerCorrect AnswerA. Creates new alleles Chromosome inversion C. Locks certain alleles together into a linkage unit B. Can immediately create new species Polyploidy (also called genome duplication) B. Can immediately create new species C. Locks certain alleles together into a linkage unit Point mutation A. Creates new alleles D. Creates small numbers of extra copies of a few genesGene duplication D. Creates small numbers of extra copies of a few genes E. Creates large numbers of extra copies of all genes Polyploidy (also called genome duplication) E. Creates large numbers of extra copies of all genes  CHAPTER 6 POPULATION GENETICS SELECTION 1. Which of the following options factually completes the statement, "If a population is in Hardy-Weinberg equilibrium..."? a. There can be no more than two alleles. b. The two alleles will be present at equal frequency. c. Allele frequencies will not change from one generation to the next. d. The dominant allele will be more common. Correct Answer:C, Allele frequencies will not change from one generation to the next.  2. If allele frequencies do not change from one generation to the next, is the population definitely in Hardy-Weinberg equilibrium? Why or why not? No, it might not be in Hardy-Weinberg equilibrium. Any process that selectively targets heterozygotes can affect genotype frequencies without necessarily changing allele frequencies in the next generation. Examples are nonrandom mating, overdominance, and underdominance.  3. The Hardy-Weinberg equilibrium principle yields which of the following conclusions? a. If the allele frequencies in a population are given by p and q, the genotype frequencies are given by p2, 2 pq and q2. b. The allele frequencies in a population will not change over time. c. If the allele frequencies in a population are given by p and q, the genotype frequencies are given by p2 and q2. d. The first and third answers are correct. e. The first and second choices are correct. Correct Answer: E, The first and third answers are correct.  4. Briefly describe all processes that can affect allele frequencies.  The processes are mutation, which introduces new alleles into the population; selection, which occurs when genotypes have different reproductive success; migration, the movement of new individuals into or out of the population; and genetic drift, the random change in allele frequencies due to chance. (A fifth process, nonrandom mating, can affect genotype frequencies but will not affect allele frequencies unless it is accompanied by selection, e.g. nonrandom mating that results in certain individuals attracting more mates.)  5. Match the key terms in this chapter listed below with the phrase that is the best match for it.  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/dot.gif" \* MERGEFORMATINET  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/dot.gif" \* MERGEFORMATINET OptionYour AnswerCorrect Answer5.1 INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/incorrect.gif" \* MERGEFORMATINET Genetic drift A. A state in which genotype frequencies are given by p2, 2pq, and q2 E. Random changes in allele frequencies that occur due to chance 5.2 INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/incorrect.gif" \* MERGEFORMATINET Selection (can be natural or artificial) A. A state in which genotype frequencies are given by p2, 2pq, and q2 D. Nonrandom changes in allele frequencies that occur due to differing reproductive success 5.3 INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/correct.gif" \* MERGEFORMATINET Hardy-Weinberg equilibrium A. A state in which genotype frequencies are given by p2, 2pq, and q2 A. A state in which genotype frequencies are given by p2, 2pq, and q2 5.4 INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/incorrect.gif" \* MERGEFORMATINET Gene pool A. A state in which genotype frequencies are given by p2, 2pq, and q2 F. The total of all copies of all genes in a population 5.5 INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/incorrect.gif" \* MERGEFORMATINET Overdominance, or heterozygote superiority A. A state in which genotype frequencies are given by p2, 2pq, and q2 B. Selection that favors heterozygotes 5.6 INCLUDEPICTURE "http://wps.prenhall.com/wps/media/styles/1480/_grader_/images/incorrect.gif" \* MERGEFORMATINET Underdominance A. A state in which genotype frequencies are given by p2, 2pq, and q2 C. Selection that favors homozygotes  6. The HIV epidemic is unlikely to lead to an increase in the CCR5 delta-32 allele over the short term because ___________________. a. In populations with high selection pressure, the allele frequency is low. b. the allele is recessive and deleterious. c. the allele is recessive and deleterious. d. The first and second choices are correct. e. in populations with a high frequency of the allele, selection pressure is relatively low. Correct Answer: D, The first and second choices are correct.  Selection will eventually cause an advantageous allele to become more common, but it's a slow process. For selection to cause a rapid increase in an allele's frequency, the selection must be strong and the allele must already be somewhat common. The delta-32 allele of CCR5 is most common in European populations, but HIV infection is low there. Selection due to HIV is strongest in Africa, but the delta-32 allele is very rare there.  7. Eastern grey squirrels (the common urban squirrel of most of the United States) sometimes can be completely black. Black squirrels usually are seen in certain isolated squirrel populations in city parks of the northeastern U.S., and are particularly common around the campus of Princeton University, in New Jersey. Black color appears to be caused by a single dominent allele, and squirrel litters can include both black and grey pups.  In 1986, 1987, and 1994, three different Princeton biology classes walked the campus and counted the number of black and grey squirrels. Here are their results. (Data from Ken Nicholson, Woodrow Wilson Biology Institute, 1994).  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/objects/3929/4023729/Illustrations/03_Q08.jpg" \* MERGEFORMATINET  Part I: Referring to the information about Eastern grey squirrels, calculate the percentage of black squirrels in each year. Have phenotype frequencies changed over time in this population, and if so, can you tell why? Can you determine if the population is in, or close to, Hardy-Weinberg equilibrium? Part II: Referring again to the information about Eastern grey squirrels, assuming the population is in Hardy-Weinberg equilibrium, calculate the frequencies of the black and grey alleles in each year.  Part I: The observed frequency of black squirrels was 16% in 1986, 26% in 1987, and 17% in 1994. The data show fluctuation in black squirrel frequency, but it is unclear whether this fluctuation is "real" - it may be due to small sample size or observational technique, and if real, there is not enough information to tell whether drift, selection, or migration, or nonrandom mating are the causes. (Mutation is unlikely to produce allele frequency changes this rapidly.) Since black squirrels may be homozygotes or heterozygotes, we cannot determine actual genotype frequencies, and thus we cannot determine if the population is in Hardy-Weinberg equilibrium. Part II: If the population is in Hardy-Weinberg equilibrium, genotype frequencies can be calculated by knowing that the frequency of grey squirrels will equal q2, solving for q, and then calculating p = 1-q. Frequencies for the grey allele and black allele were:  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/objects/3929/4023729/Illustrations/03_Q08.jpg" \* MERGEFORMATINET  Black coat color in squirrels is theorized to be advantageous in cold climates due to greater absorption of solar radiation, but disadvantageous where natural predators are numerous due to the conspicuousness of black squirrels. This may explain the greater frequency of the black color morph in northeastern city parks, which have cold winters but few natural predators.  8. Over the long term, selection favoring the rare phenotype in a polymorphic population (i.e., negative frequency dependent selection), will __________ genetic diversity in the population. a. decrease b. increase c. maintain Correct Answer:C, maintain  Negative frequency-dependent selection maintains rare alleles in the gene pool. It can even keep alleles that are slightly deleterious in the population, if the alleles gain a strong advantage when their phenotype becomes rare. (Remember that another process that can maintain rare or deleterious alleles is heterozygote superiority.)  9. Which of these statements is true for underdominance? a. Allele frequencies will tend to move towards fixation or loss. b. Allele frequencies will tend to move toward a stable equilibrium. c. Allele frequencies may initially hover at an unstable equilibrium, but will eventually change. Correct Answers:Allele frequencies may initially hover at an unstable equilibrium, but will eventually change. Allele frequencies will tend to move towards fixation or loss.  10. When selection acts against a recessive allele that is initially at high frequency in a population, ____________________. a. the frequency of the allele will stay high for a long time, then decline slowly. b. the allele declines in frequency until it is eliminated. c. the frequency of the allele will be unchanged; b. the population will remain in Hardy-Weinberg equilibrium. the frequency of the allele will decline rapidly, and then stabilize at very low frequency. Correct Answer:the frequency of the allele will decline rapidly, and then stabilize at very low frequency.  11. When selection favors heterozygotes over homozygotes, ____________________. a. both alleles are maintained at a frequency different from that predicted by Hardy-Weinberg principles based on the strength of selection against the recessive allele. b. the selective advantage enjoyed by the deleterious allele in the heterozygote exactly c. genetic diversity in the population can be maintained indefinitely, in spite of selection acting against the allele. balances the selective disadvantage suffered by homozygous recessive individuals. d. The first two choices are both correct. e. The first three choices are correct. Correct Answer:The first three choices are correct.  This phenomenon is called overdominance or heterozygote superiority, and it can maintain deleterious alleles in populations. It may explain the puzzle of why natural populations have surprisingly high genetic diversity.  12. When selection favors homozygotes over heterozygotes ____________________. a. genetic variation among populations will decline.  b. the most common outcome will be that the most common allele will become fixed (will increase to a frequency of 1) in the population.  c. both alleles are maintained in the population at frequencies different from those predicted by Hardy-Weinberg principles.  d. the genetic variation within a population is maintained over time Correct Answer:the most common outcome will be that the most common allele will become fixed (will increase to a frequency of 1) in the population.  This is a case of underdominance. Allele frequencies may initially hover at an unstable equillibrium, but inevitably, sooner or later, it will drift from that equilibrium. As soon as it starts to drift, the rarer allele will be found more frequently in heterozygotes, where it will be selected against, and it will quickly be lost.  13. Pier and his colleagues have suggested that cystic fibrosis is maintained at relatively high levels in people of European ancestry because of heterozygote superiority; specifically, he proposposes that heterozygotes are more resistant to typhoid fever than are the dominant homozygotes. Evidence in favor of this hypothesis includes which of the following findings? a. The mutation rate for new loss-of-function mutations in the CFTR gene is too low for the prevalence of the disease to be explained by mutation/selection balance.  b. Pier and his colleagues have found, in 11 European countries, an association between the severity of typhoid fever outbreaks and the frequency of the delta-F508 allele (the most common loss-of-function mutation) a generation later.  c. Pier et al. engineered cells homozygous for functional CFTR alleles, homozygous for a common loss-of-function allele, and heterozygous for the two. The loss-of-function homozygotes were virtually impervious to invasion by typhoid fever-causing bacteria; heterozygotes were more vulnerable, but accumulated 86% fewer bacteria than did the dominant homozygotes.  d. All of the choices above are correct.  e. Salmonella typhi bacteria manipulate their host cells, causing them to express more CFTR protein on their membranes. Correct Answer:All of the choices above are correct.  14. According to the basic model of mutation/selection balance, if selection is strong and mutation rate is low, the equilibrium frequency of a deleterious allele will be __________; when selection is weak and the mutation rate is high, the frequency of the allele will be relatively __________. low/low  low/high  high/low  high/high Correct Answer:low/high  15. Which of the following statements about mutation-selection balance is true? A model that predicts an equilibrium frequency that is equal to the square root of selection strength over mutation rate.  The process that currently maintains the high frequency of the cystic fibrosis phenotype.  The process that maintains two flower colors in elderflower populations.  Positive selection of an allele at the same rate that it is introduced by mutation.  A model that only applies to deleterious alleles. Your Answer:The process that currently maintains the high frequency of the cystic fibrosis phenotype. Correct Answer:A model that only applies to deleterious alleles.  16. What are compound chromosomes, and how do they affect fertility? Why are they uniquely suited for studies of underdominance?  Compound chromosomes are chromosomes that have swapped entire arms. Animals with compound chromosomes can produce fertile offspring only if they mate with other individuals carrying the same compound chromosome (and even then, 3/4 of zygotes are inviable). Therefore, a population in which some individuals have one kind of compound chromosome, and some have a different compound chromosome, will be analogous to a case of underdominance, because some purebred zygotes (analogous to homozygotes) will survive, but all hybrid zygotes (analogous to heterozygotes) will die.  17. Three of the following conditions are necessary for selection of one phenotype over another to lead to evolutionary change. Which statement is not? The phenotypes differ in reproductive success.  Selection is strong enough to counteract any opposing effects of drift, migration, and mutation.  The phenotypes are not affected by environment.  The phenotypes are caused by heritable variation in genotype.  INCLUDEPICTURE "http://homepage.mac.com/jonherron/wps/media/styles/1480/_skins_/D/default_blue/pixel.gif" \* MERGEFORMATINET  INCLUDEPICTURE "http://homepage.mac.com/jonherron/wps/media/styles/1480/_skins_/D/default_blue/ps_bkgd_lower_left.gif" \* MERGEFORMATINET  INCLUDEPICTURE "http://homepage.mac.com/jonherron/wps/media/styles/1480/_skins_/D/default_blue/ps_bkgd_lower_right.gif" \* MERGEFORMATINET  Correct Answer:The phenotypes are not affected by environment.  18. Describe at least two major biological flaws in logic of the forced sterilization program for eliminating feeblemindedness.  Two of the biggest flaws were, first, "feeblemindedness" had a very strong environmental component and was not clearly related to heritable genetic variation as had been proposed; the estimates of heritability were biased due to circular reasoning in data collection. Second, even if "feeblemindedness" were mostly due to a rare recessive allele, even strong selection would not appreciably reduce the frequency of the allele.  19. There are two common alleles for the human muscle enzyme ACE (angiotensin-converting enzyme)-a shorter D allele, and a longer I allele that has an insertion of 287 base pairs.The ACE coded by the I allele has lower activity, but it is also associated with superior muscular performance after physical training. One study (Williams et al. 2000) of 35 II and 23 DD men found that though they didn't differ in muscular efficiency before training, after 11 weeks of aerobic training, the II homozygotes had 8% greater muscular efficiency.The I allele is also associated with greater endurance and greater muscular growth after strength training. Speculate on why the D allele still remains at relatively high frequency in the human population. How could you test your ideas?  There are many possible answers. The I allele might have some costs, such as (say) lowered speed of muscle contraction; the D allele might have unknown benefits; there might be heterozygote superiority. Also, genetic drift, mutation or migration might have caused the D allele to be at higher frequency than would be predicted by selection alone, particularly since the strength advantage for II homozygotes appears relatively minor. Some obvious research paths are: testing other measures of fitness; testing heterozygotes; investigating mutation rate; examining allele frequencies in various different human populations.  20. Consider what makes a new mutant allele dominant or recessive. To guide your thinking, imagine an enzyme that changes substance A to substance B. If B is a nutrient that is needed only in minimal amounts, will a loss-of-function mutation be dominant or recessive? If A is an abundant toxin that must be entirely broken down, will a loss-of-function mutation be dominant or recessive? How about a new mutant allele that results in a form of the protein that can catalyze an entirely new reaction (say, from A to new substance C?) Can you think of other examples of protein function that will affect whether a new allele is dominant or recessive?  Whether an allele is dominant or recessive depends on what happens in heterozygotes, which in turn often depends on whether the dose of normal gene product is more important than its mere presence. Consider a heterozygote with one normal allele and one loss-of-function allele. The heterozygote's cells will only produce half of the normal amount of gene product. If the only thing that matters for the trait is whether the gene product is produced at all, then the heterozygote will appear normal - the normal allele will be dominant over loss-of-function allele. But if the amount of the gene product is very important, then the heterozygote will have an altered phenotype, because it is only making half the gene product. in this case, loss-of-function alleles will be either dominant or codominant. In the examples given, a loss-of-function allele will usually be recessive for production of a minimally needed nutrient; dominant for breaking down an abundant toxin; and dominant for catalyzing a new reaction.  21. West Nile virus is an emerging disease that has rapidly spread across North America in recent years, infecting birds, humans and horses. It can cause severe flu-like symptoms and fatal encephalitis in humans. Glass and colleageus recently sequenced CCR5 genotypes in several hundred West Nile virus patients in Arizona and Colorado, and compared them to another group of patients that also had flu-like illnesses, but did not have West Nile. Here are the distributions of genotypes in patients with and without West Nile:  Part I: Referring to the West Nile virus information given above, what was the frequency of the CCR5-delta32 allele in both of these patient cohorts? The CCR5-delta32 allele is at Hardy-Weinberg equilibrium in the North American population at large. Does either patient population appear to be in Hardy-Weinberg equilibrium? (You may assess your data "by eye," without statistical tests, if you wish.) Part II: The percentage of CCR5-delta homozygotes in North America is usually 1%. How does this compare to both populations? Part III: Propose an explanation for the data. How does this compare with the situation of CCR5-delta in HIV susceptibility? What are the selective forces of the two diseases on this locus?  Part I: Genotype frequencies in the West Nile population were 0.88 for the normal CCR5 allele, and 0.12 for the delta-32 allele. For the control population, frequencies were 0.93 for the normal CCR5 allele, and 0.07 for the delta-32 allele. The West Nile patients appear to not be in Hardy-Weinberg equilibrium (actual percentages 0.80, 0.16, 0.04; compared to expected Hardy-Weinberg genotype frequencies of 0.77, 0.21, and 0.01. (The deviation from Hardy-Weinberg equilibrium is statistically significant.) The control patients are in virtually perfect Hardy-Weinberg equilibrium (frequencies of 0.86, 0.13, and 0.01). Reference: Glass, W.G., D.H. McDermott, J.K. Lim, S. Lekhong, S.F. Yu, W.A. Frank, J. Pape, R.C. Cheshier, and P.M. Murphy. 2006. CCR5 deficiency increases risk of symptomatic West Nile virus infection. J. Exp. Med. 203(1):35-40. Part II: CCR5-delta32 homozygotes are present at the normal frequency in the control patients, but are nearly four times more common than usual in the West Nile patients. Reference: Glass, W.G., D.H. McDermott, J.K. Lim, S. Lekhong, S.F. Yu, W.A. Frank, J. Pape, R.C. Cheshier, and P.M. Murphy. 2006. CCR5 deficiency increases risk of symptomatic West Nile virus infection. J. Exp. Med. 203(1):35-40. Part III: Several explanations are possible. CCR5-delta32 is suspected to increase susceptibility to West Nile virus infection, and/or increase risk of progression to the severe form of the disease. (It also increased risk of mortality in this study.) This is in sharp contrast to the situation in HIV, in which CCR5-delta32 confers protection against infection by HThe two diseases are exerting opposing selection on the CCR5 locus, West Nile selecting against the delta32 allele, and HIV selecting for it. The opposing effects of these two diseases make more sense if we consider West Nile's type of viral attack is quite typical for viruses, while HIV is very unusual in its specific targeting of immune cells. In other words, West Nile is the kind of virus that the immune system probably evolved to defend against, but HIV is not. Alert readers will also have noticed a deficit of heterozygotes in the West Nile group. It is possible that there might be a heterozygote advantage. Reference: Glass, W.G., D.H. McDermott, J.K. Lim, S. Lekhong, S.F. Yu, W.A. Frank, J. Pape, R.C. Cheshier, and P.M. Murphy. 2006. CCR5 deficiency increases risk of symptomatic West Nile virus infection. J. Exp. Med. 203(1):35-40.  22. Left-handedness in humans is associated with a variety of subtle health and fitness costs, yet remains at high frequency in some human populations. Left-handers often have an advantage in baseball, tennis, fencing and other sports in which pairs of individuals face off against each other. Since most players train against right-handers, they are less able to defend themselves against a left-handed opponent. Based on this phenomenon in sports, it has been proposed that left-handedness may be maintained in human populations due to an advantage in hand-to-hand combat.  INCLUDEPICTURE "http://wps.prenhall.com/wps/media/objects/3929/4023729/Illustrations/03_Q08.jpg" \* MERGEFORMATINET  Part I: What type of selection is being proposed? Part II: Geneticists Charlotte Faurie and Michel Raymond recently studied the frequency of left-handers in traditional societies, compared to the level of "violence" in those societies. They used homicide rate as an index of violence. The figure below shows their data. Are the data consistent with the hypothesis that left-handedness gives an advantage in combat?  INCLUDEPICTURE "http://homepage.mac.com/jonherron/wps/media/objects/3929/4023729/Illustrations/06_Q22.jpg" \* MERGEFORMATINET  Part III: Suppose the combat hypothesis is true. In extremely violent societies, would you predict that left-handedness would increase to fixation? Part IV: If left-handedness had no costs, would you expect left-handedness to change over time in any of these societies? Explain. Your Answer:vPart I: frequency-dependent selection Source: Faurie C, Raymond M. 2004. Handedness, homicide, and negative frequency-dependent selection. Proc. R. Soc. B. 272:25-28. Part II: The data are consistent with the combat hypothesis. Source: Faurie C, Raymond M. 2004. Handedness, homicide, and negative frequency-dependent selection. Proc. R. Soc. B. 272:25-28. Part III: No. First, left-handers would lose their combat advantage if the frequency of left-handedness rose above 0.50. In addition, recall that left-handedness also carries several costs that right-handedness does not carry. This should keep left-handedness below 0.50, even in a population with a large amount of hand-to-hand combat. (The Yanomamo may represent the maximum frequency for left-handedness.) Source: Faurie C, Raymond M. 2004. Handedness, homicide, and negative frequency-dependent selection. Proc. R. Soc. B. 272:25-28. Part IV: If left-handedness carried no costs, we would expect left-handedness to increase to 0.50 (half the population) in all societies. This should occur more quickly in the more violent societies. Once at 0.50, left-handedness and right-handedness should remain at equal frequency. (Any time that one phenotype declined below 0.50, it would begin to enjoy a selective advantage in combat, and should come back up to 0.50 again.) 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