Jack and Jill Are Twins

question 141

Multiple Choice

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.

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Definitions:

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