Assuming that the woman in the couple is a carrier, what is the probability that the couple’s first son will have hemophilia?
(A) 0%
(B) 25%
(C) 50%
(D) 100%

Hemophilia is an X-linked disease associated with the inability to produce specific proteins in the blood-clotting pathway. In Figure 1, the family members afflicted with the disease are shown with filled-in squares (male) or circles (females). A couple is trying to determine the likelihood of passing on the disease to their future children (represented by the ? symbol above) because the hemophilia runs in the woman’s family.

Transcribed Image Text:

O Male Female O ㅂㅇㅁ ?