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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Definitions:

Neurotransmitters

Chemical substances in the nervous system that transmit signals from one neuron to another across synapses.

Opioid Peptides

Natural chemicals in the brain that act like morphine, playing key roles in pain relief, reward, and addictive behaviors.

Oxytocin

A hormone and neurotransmitter involved in childbirth, lactation, and social bonding.

Endocrine Gland

Glands of the endocrine system that release hormones directly into the bloodstream to regulate various body functions.