Identical twins have more similar sleep patterns than do fraternal twins,and people in industrialized nations go to bed later at night than their counterparts of a century ago.These facts best illustrate that sleep patterns are affected by both
A) rapid eye movements and sleep spindles.
B) latent content and manifest content.
C) alpha waves and beta waves.
D) heredity and environment.

Question

Quizplus · Accepted Answer

The fact that identical twins have more similar sleep patterns than fraternal twins suggests that genetics play a role in determining sleep patterns. The fact that people in industrialized nations have changed their sleep patterns over the past century suggests that environment also plays a role in sleep patterns. Therefore, sleep patterns are affected by both heredity and environment.

Identical Twins Have More Similar Sleep Patterns Than Do Fraternal