Question

In humans, hemophilia is a sex-linked recessive trait. If a female who is a carrier for hemophilia marries a male with normal blood clotting, answer the following questions.
A. What fraction of the female children will have hemophilia?


B. What fraction of the female children will be carriers?


C. What fraction of the male children will have normal blood clotting?

D. What fraction of the male children will be carriers?

E. What fraction of the male children will have hemophilia?

Answer 1

Answer:

1) A. she gets the X chromosome with the hemophilia gene, she will have hemophilia. A man who has hemophilia and a woman who is a carrier have: a 25% (one in four) chance of having a son with hemophilia. a 25% chance of having a son with normal blood clotting.

2) B. What fraction of the female children will be carriers? 50%.

3) C. a 25% chance of having a son with normal blood clotting.

4) D. What fraction of the male children will be carriers? 07.

5) E. What are the chances of having a child with hemophilia? No sons of a man with hemophilia will have hemophilia. All daughters of a man with hemophilia will be carriers (called obligate carriers). If a carrier has a son, the son has a 50% chance of having hemophilia.