Of those identical (monozygotic) twins where one twin is homosexual, the other twin is also homosexual in 50% of cases. This means

Question

Quizplus · Accepted Answer

The 50% concordance rate among identical twins where one twin is homosexual shows that genetics is only one influence on sexual orientation, and that other factors, such as the environment, likely also play a role. Therefore, Choice B is the best answer.

Of Those Identical (Monozygotic) Twins Where One Twin Is Homosexual