Monohybrid Practice Problems and Solutions



Monohybrid Practice Problems and Solutions

Straight hair is dominant and curly hair is recessive.

1. Diagram a Punnett Square for 2 heterozygous parents.

2. What is the parents’ genotype(s)?

3. What is the parents’ phenotypes(s)?

4. What is the genotypic ratio for the offspring?

5. What is the probability of producing a curly-haired child? (In percent)

White-spotted beetles are dominant over solid colored beetles. A heterozygous male is crossed with a solid colored female.

6. What is the mother’s genotype?

7. What is the father’s genotype?

8. Diagram a Punnett Square for this cross.

9. What is the genotypic ratio?

10.What is the phenotypic ratio?

11.What is the probability of producing a spotted beetle?

ANSWERS

1. S s S = straight hair s = curly hair

|SS |Ss |

| Ss |ss |

S

s

(You could also have used H = straight hair, h = curly hair)

2. Ss

3. straight hair

4. 1:2:1

5. 25%

6. ww

7. Ww

8. W w

|Ww |ww |

|Ww |ww |

w

w (You could also have used B for Beetle)

9. 1:1

10. 1:1

11. 50%

Monohybrid Practice Problems and Solutions

Straight hair is dominant and curly hair is recessive.

1. Diagram a Punnett Square for 2 heterozygous parents.

2. What is the parents’ genotype(s)?

3. What is the parents’ phenotypes(s)?

4. What is the genotypic ratio for the offspring?

5. What is the probability of producing a curly-haired child? (In percent)

White-spotted beetles are dominant over solid colored beetles. A heterozygous male is crossed with a solid colored female.

6. What is the mother’s genotype?

7. What is the father’s genotype?

8. Diagram a Punnett Square for this cross.

9. What is the genotypic ratio?

10.What is the phenotypic ratio?

11.What is the probability of producing a spotted beetle?

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