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:

Price-elastic

Describes a situation where the demand for a product is sensitive to price changes.

Home Entertainment System

An array of electronic devices set up in a home to reproduce the experience of watching movies or listening to music in a theater-like setting.

Quaker State Oil

A brand known for producing motor oil and other automotive lubricants and products, with a long history in the United States.

Price-elastic

A product or service is considered price-elastic when its demand significantly changes in response to a change in its price; high elasticity indicates significant changes in demand.