One Effect of Frequent Drug Use Is Changes in Brain

question 9

Multiple Choice

One effect of frequent drug use is changes in brain circuits.This leads to

• A) increased REM sleep.
• B) decreased drug tolerance.
• C) increased behavioral inhibitions.
• D) strong cravings when situations trigger memories of drug use.

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Definitions:

Allele Frequencies

A measure of how common a particular genetic variant (allele) is within a population's gene pool.

Genetic Stasis

A period or state in which the genetic composition of a population remains relatively unchanged over time.

Polymorphism

The presence of two or more distinct forms (variations) of a gene or trait within a population.

Random Mating

A mating system in which all individuals in a population have an equal opportunity to mate with any other member of the opposite sex.