The fact that identical twins are more likely to share sexual orientation than fraternal twins suggests that sexual orientation is
A)due to the environment.
B)in part genetic.
C)largely chemical.
D)primarily hormonal.

Question

The fact that identical twins are more likely to share sexual orientation than fraternal twins suggests that sexual orientation is ​
A)due to the environment.
B)in part genetic.
C)largely chemical.
D)primarily hormonal.

Quizplus · Accepted Answer

Studies comparing identical twins (who share all their genes) with fraternal twins (who share about half their genes) have shown that when one identical twin is gay, there is a higher likelihood that the other will be too, compared to fraternal twins. This suggests a genetic component to sexual orientation.

The Fact That Identical Twins Are More Likely to Share