Peter has always known he was gay and has always been curious as to why he may be gay when he didn't choose to be gay and does not have any family members who are gay. One day Peter reads that sibling patterns can predict homosexuality in men and he realizes that his family fits the pattern. What sibling pattern exists in Peter's family?

Question

Quizplus · Accepted Answer

The sibling pattern that predicts homosexuality in men is having many older brothers. This is known as the fraternal birth order effect, which suggests that each older brother increases the likelihood of a man being gay by approximately 33%. This is thought to be related to a maternal immune response to male fetuses, which may affect the developing brain of later-born male children.

Peter Has Always Known He Was Gay and Has Always