A Type of Muscular Dystrophy Shows Sex-Linked Recessive Inheritance

question 49

Multiple Choice

A type of muscular dystrophy shows sex-linked recessive inheritance. Affected persons usually die by the age of 20. Suppose that a boy with the disease lives long enough to marry a woman heterozygous for the trait. If they have a son, what is the probability that he will have the disease?

• A)25%
• B)50%
• C)75%
• D)100%
• E)0%

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