1. If a woman is a carrier for a sex-linked recessive trait of hemophilia and her husband has hemophilia, which of the following is true?
A. All sons will have hemophilia
B. All daughters will have hemophilia C. 50% of daughters and 50% of sons have hemophilia
D. 0% of sons have hemophilia but 100% of daughters are carriers
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Answer:
C.
Explanation:
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. If a carrier has a daughter, the daughter has a 50% chance of being a carrier.