The Fact That the Rate of Homosexual Concordance Is Substantially

question 108

Multiple Choice

The fact that the rate of homosexual concordance is substantially higher for identical twins than for nonidentical twins argues in favor of a genetic contribution to sexual orientation.Why does this finding also show us that genetic factors aren't the sole determinants of sexual determinants?

• A)If the genetic factors were acting in isolation, then the rates of concordance should be higher for nonidentical twins than for identical twins.
• B)If the genetic factors were acting in isolation, then the rates of concordance should include adopted siblings as well as cotwins.
• C)If genetic factors were the only determinants involved, then the rate of concordance would be 50 percent.
• D)If genetic factors were the only determinants involved, then the rate of concordance would be 100 percent.

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Definitions:

Priming

A psychological phenomenon in which exposure to one stimulus influences a response to a subsequent stimulus, without conscious guidance or intention.

Bottom-up Processing

An approach to processing information that begins with the sensory receptors and works up to the brain's integration of sensory information.

Context Effects

The influence of environmental factors on one's perception of a stimulus, affecting how the stimulus is processed and understood.

Sensory Adaptation

The method through which sensory receptors adapt their responsiveness to a stimulus over a period, frequently leading to reduced sensitivity towards a steady stimulus.