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

question 42

Multiple Choice

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

• A) 0
• B) 1/4
• C) 1/2
• D) 1/8
• E) 1

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