Hemophilia Is Caused by an X-Linked Recessive Mutation in Humans

question 49

Multiple Choice

Hemophilia is caused by an X-linked recessive mutation in humans.If a woman whose paternal uncle (father's brother) was a hemophiliac marries a man whose brother is also a hemophiliac, what is the probability of their first child having hemophilia (Note: assume that there are no other cases of hemophilia in the pedigree and no hidden carriers) ?

• A)0
• B)1/4
• C)1/2
• D)1/8
• E)1

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