ࡱ> []Zq` bjbjqPqP .H:: d-----( 5........65858585858585$6h 9\5.....\5..q5000...650.65000.x. DN-/"0250509/900d9r2 ..0.....\5\5/....5....( ( ( ( ( ( 2DvJ Genetics Practice Problems - Simple Worksheet 1. For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho) AA _____Ee ____Ii _____Mm _____Bb _____ff ____Jj _____nn _____Cc _____Gg ____kk _____oo _____DD _____HH ____LL _____Pp _____2. For each of the genotypes below determine what phenotypes would be possible. Purple flowers are dominant to white flowers. PP __________________ Pp __________________ pp __________________ Round seeds are dominant to wrinkled seeds. RR __________________ Rr __________________ rr __________________Brown eyes are dominant to blue eyes BB ________________ Bb ________________ bb ________________ Bobtails in cats are recessive. TT _________________ Tt _________________ tt __________________3. For each phenotype below, list the genotypes (remember to use the letter of the dominant trait) Straight hair is dominant to curly. ____ straight ____ straight ____ curlyPointed heads are dominant to round heads. _____ pointed _____ pointed _____ round4. Set up the Punnet squares for each of the crosses listed below. Round seeds are dominant to wrinkled seeds. Rr x rr What percentage of the offspring will be round? _______________RR x rr What percentage of the offspring will be round? _______________RR x Rr What percentage of the offspring will be round? _______________Rr x Rr What percentage of the offspring will be round? _______________ Practice with Crosses. Show all work! 5. A TT (tall) plant is crossed with a tt (short plant). What percentage of the offspring will be tall? ___________ 6. A Tt plant is crossed with a Tt plant. What percentage of the offspring will be short? ______ 7. A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous (RR)? __________ 8. A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? __________ x __________ What percentage of the offspring will also be homozygous? ___________ 9. In pea plants purple flowers are dominant to white flowers. If two white flowered plants are cross, what percentage of their offspring will be white flowered? ______________ 10. A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the offspring will have purple flowers?___________ 11. Two plants, both heterozygous for the gene that controls flower color are crossed. What percentage of their offspring will have purple flowers? ____________ What percentage will have white flowers? ___________ 12. In guinea pigs, the allele for short hair is dominant. What genotype would a heterozygous short haired guinea pig have? _______ What genotype would a purebreeding short haired guinea pig have? _______ What genotype would a long haired guinea pig have? ________ 13. Show the cross for a pure breeding short haired guinea pig and a long haired guinea pig. What percentage of the offspring will have short hair? __________ 14. Show the cross for two heterozygous guinea pigs. What percentage of the offspring will have short hair? ________ What percentage of the offspring will have long hair? _______ 15. Two short haired guinea pigs are mated several times. Out of 100 offspring, 25 of them have long hair. 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