Hemophilia Is Caused by Several Genetic Factors; One, a Recessive

question 26

Multiple Choice

Hemophilia is caused by several genetic factors; one, a recessive allele of an X- linked gene, is the subject of this problem. Assume that a man with hemophilia marries a normal woman whose father had hemophilia. What is the probability that their first son will have hemophilia?

• A) 1/2
• B) 1/4
• C) 3/4
• D) 1/16
• E) 1/8

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Definitions:

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