Question
Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb marries a man who is heterozygous for hitchhiker's thumb. What is the probable genotypic ratio of their children? (SC.912.L.16.1)
*
1 point
0% Hh: 100% hh
50% Hh: 50% hh
75% Hh: 25% hh
100% Hh: 0% hh
Answers
GPT-4o mini
To determine the probable genotypic ratio of the children from the given parents, we need to consider their genotypes.
- The woman who does not have hitchhiker's thumb has the genotype **hh**.
- The man who is heterozygous for hitchhiker's thumb has the genotype **Hh**.
When these two parents have children, we can set up a Punnett square to predict the genotypes of their offspring:
```
H h
----------------
h | Hh | hh |
----------------
h | Hh | hh |
----------------
```
From the Punnett square, we see the following results for the genotypes of the children:
- 50% Hh (heterozygous with hitchhiker's thumb)
- 50% hh (homozygous without hitchhiker's thumb)
Thus, the probable genotypic ratio of their children is:
**50% Hh : 50% hh**
Therefore, the correct answer is:
**50% Hh: 50% hh**
- The woman who does not have hitchhiker's thumb has the genotype **hh**.
- The man who is heterozygous for hitchhiker's thumb has the genotype **Hh**.
When these two parents have children, we can set up a Punnett square to predict the genotypes of their offspring:
```
H h
----------------
h | Hh | hh |
----------------
h | Hh | hh |
----------------
```
From the Punnett square, we see the following results for the genotypes of the children:
- 50% Hh (heterozygous with hitchhiker's thumb)
- 50% hh (homozygous without hitchhiker's thumb)
Thus, the probable genotypic ratio of their children is:
**50% Hh : 50% hh**
Therefore, the correct answer is:
**50% Hh: 50% hh**