Jack and Jill are twins. Because he is a boy, Jack's parents encourage him to run. However, they discourage Jill from engaging in athletic activity. As a result, Jack is much faster at running up a hill than Jill. The difference in Jack and Jill's behavior is best explained by
A) nonshared environmental influences.
B) active gene-environment relations.
C) polygenetic effects.
D) niche-picking.

Question

Quizplus · Accepted Answer

The difference in Jack and Jill's behavior is best explained by nonshared environmental influences, which refer to the environmental factors that are not shared between siblings and can lead to differences in their behaviors and personalities. In this case, the parents' differential treatment based on gender is a nonshared environmental influence that affects Jack and Jill differently.

Jack and Jill Are Twins