A Researcher Finds That for a Particular Trait, the Correlation

question 106

Multiple Choice

A researcher finds that for a particular trait, the correlation between identical twins is greater than is the correlation between nontwin siblings. This result demonstrates that

• A) environmental factors are important in the development of this trait.
• B) genetic factors are important in the development of this trait.
• C) genetic factors are not important in the development of this trait.
• D) environmental factors are not important in the development of this trait.

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Definitions:

Upper Brainstem

The part of the brainstem that is closer to the top part of the brain, involved in basic life functions such as consciousness, breathing, and heart rate.

Lower Brainstem

A region at the base of the brain connecting to the spinal cord, responsible for fundamental life-sustaining functions such as breathing and heart rate.

Cerebellum

The part of the brain at the back of the skull in vertebrates, which coordinates and regulates muscular activity, balance, and motor learning.

Circadian Rhythm

The natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours, influencing physical, mental, and behavioral changes.