The greater the number of ________, the higher the probability that the next-born son will be attracted to men.

Question

Quizplus · Accepted Answer

Research has shown that having older biological brothers increases the likelihood of a man being attracted to other men. This effect is thought to be due to changes in the prenatal environment caused by the presence of maternal antibodies produced in response to male-specific proteins. The more older biological brothers a man has, the higher the levels of these antibodies, and the stronger the likelihood of same-sex attraction. Factors such as number of alleles or sisters do not have a clear and direct relationship with sexual orientation.

The Greater the Number of ________, the Higher the Probability