Question

In humans the allele for normal blood clotting is dominant to the allele for hemophilia.This gene is on the X chromosome. A heterozygous woman (a carrier) for the traitmarries a man with hemophilia. What is the probability of the couple having a normal(non-carrier) daughter?0%25%50%75%100%

Answer 1

0%

Step-by-step explanation:

Parents: Carrier woman x Hemophilic man

Genotype: XᴴXʰ x XʰY

Cross:
`\left[\begin{array}{ccc}&XH&Xh\\Xh&XHXh&XhXh\\Y&XHY&XhY\end{array}\right]`

Result:

50% daughters are carrier, 50% daughters are hemophilic, 50% sons are normal, and 50% sons are hemophilic.

Conclusion:

When a heterozygous woman (a carrier) for the trait marries a man with hemophilia, the probability of the couple having a normal (non-carrier) daughter is 0%.