Hemophilia is a blood clotting disorder that is a sex-linked trait carried on the X chromosome. If a woman with hemophilia and a man without the disorder have two sons and two daughters, how many of their children would have hemophilia?

A: None

B: One

C: Two

D: Four

Question

Hemophilia is a blood clotting disorder that is a sex-linked trait carried on the X chromosome. If a woman with hemophilia and a man without the disorder have two sons and two daughters, how many of their children would have hemophilia?

A:  None

B:  One

C:  Two

D:  Four

aaronq · Answer

you have to know that Hemophilia is an X-linked recessive condition, this means that the mother has $X^hX^h$ and the dad has $XY$.

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SO all females are carriers and all males have the condition.