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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Definitions:

Variable Interval

A reinforcement schedule where rewards are given after unpredictable time intervals, leading to moderate but steady response rates.

Fixed Interval

In operant conditioning, a schedule of reinforcement where the first response is rewarded only after a specified amount of time has elapsed.

Partial Reinforcement Effect

The typical outcome of a variable ratio of reinforcement in which a slow rate of initial learning is coupled with resistance to extinction.

Continuous Reinforcement

A learning process in which a behavior is rewarded every time it is exhibited, leading to rapid learning.