Which of the following would be considered evidence that supports genetic influences in sexual orientation?
A)Fifty-two percent of monozygotic twins are concordant for gay sexual orientation.
B)Gay men are more likely to come from families with domineering mothers.
C)The brains of lesbians are slightly asymmetrical when compared to heterosexual women.
D)Lesbians are more likely to have been exposed to high levels of testosterone while in utero.

Question

Quizplus · Accepted Answer

The fact that 52% of monozygotic twins (who share 100% of their genes) are concordant (both have the same sexual orientation) provides evidence for a genetic influence on sexual orientation.

Answer: D
 The fact that lesbians are more likely to have been exposed to high levels of testosterone while in utero provides some evidence for a biological (i.e. genetic) influence on sexual orientation. However, it is important to note that this is not a direct measure of genetics and could also be influenced by environmental factors.

Answer: B and C are not supported by the current scientific consensus and are not considered evidence for genetic influences on sexual orientation. The idea that domineering mothers cause their sons to be gay, for example, is a common stereotype but has been thoroughly debunked by research. The slight asymmetry in brain structure seen in lesbians is interesting but not well-understood, and it is not clear whether this represents a direct genetic influence or a result of environmental factors.

Which of the Following Would Be Considered Evidence That Supports