Simon's psychology professor states that homosexual men tend to have more homosexual relatives on their mother's side than on their father's,which supports a genetic basis for homosexuality.The position explained by Simon's professor is called

A) the fertile females theory.
B) the fraternal birth-order effect.
C) the older-brother effect.
D) erotic plasticity.

Fertile Females Theory

A hypothesis in evolutionary biology suggesting that certain behavioral or physical traits in females signal reproductive potential to males.

Fraternal Birth-Order Effect

A phenomenon where the more older brothers a man has, the higher his likelihood of being homosexual.

Genetic Basis

The underlying genetic makeup or heritable factors that contribute to the physical and behavioral characteristics of an organism.