Turner syndrome is a disease in which an individual is born with only a single X chromosome. Suppose the woman in the couple is a carrier for hemophilia and has a child with Turner syndrome. Would this child have the disease?
(A) Yes, because the child would have only one copy of the X chromosome and therefore would be affected.
(B) No, because women cannot be affected by hemophilia.
(C) No, because the child would have to receive a normal copy of the X chromosome from its mother.
(D) Maybe; it depends on which X chromosome she receives from her mother.

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 ?