In Humans, Male-Pattern Baldness May Be Assumed to Be Controlled

question 37

Multiple Choice

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

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

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