A Gene That Controls the Ability to Metabolize Lactose Is

Multiple Choice

A gene that controls the ability to metabolize lactose is common in people in some parts of the world and rare in other parts of the world. That gene is largely responsible for variations in the probability that a person will

A) suffer from migraine headaches.
B) enjoy dairy products as an adult.
C) become severely depressed.
D) have trouble sleeping when adjusting to a change in time zones.