Which of the following set of brother/sister combinations has a higher association with the possibility of a person being a homosexual?
A)having an older female sibling
B)having an identical twin who is homosexual
C)having an identical twin who is heterosexual
D)having a younger female sibling

Question

Quizplus · Accepted Answer

Research has shown that having an identical twin who is homosexual has a higher association with the possibility of a person being homosexual compared to other sibling combinations. This suggests that genetics may play a larger role in sexual orientation than upbringing or environmental factors.

Which of the Following Set of Brother/sister Combinations Has a Higher