Posted: April 12th, 2017

A man with hemophilia (a recessive, sex-linked condition) has a daughter of normal phenotype. She marries a man who is normal for the trait. What is the probability that a daughter of this mating will be hemophiliac? That the son will be hemophiliac? If the couple has four sons, what is the probability that all four will be born with hemophilia?

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