Having an older brother slightly increases the probability that the younger brother develops a gay orientation.That observation supports which of the following as an influence on sexual orientation?

Question

Having an older brother slightly increases the probability that the younger brother develops a gay orientation.That observation supports which of the following as an influence on sexual orientation?​

Quizplus · Accepted Answer

The observation supports the prenatal environment hypothesis, which suggests that hormonal and other biological factors affecting a fetus can influence sexual orientation. The "fraternal birth order effect" posits that a mother's immune response to male-specific antigens increases with each male fetus, potentially affecting the sexual orientation of subsequent male children.

Having an Older Brother Slightly Increases the Probability That the Younger