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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