In Humans, Male-Pattern Baldness Is Controlled by an Autosomal Gene

question 13

Multiple Choice

In humans, male-pattern baldness is controlled by an autosomal gene that occurs in two allelic forms. Allele Hn determines nonbaldness, and allele Hb determines pattern baldness. In males, because of the presence of testosterone, allele Hb is dominant over Hn. If a man and woman both with genotype HnHb have a son, what is the chance that he will eventually be bald?

• A) 0%
• B) 25%
• C) 33%
• D) 50%
• E) 75%

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