The genetic influence on sexual orientation has been supported by research reporting that _____.
A) among identical twins, if one brother is gay, the other brother has a 48-65% chance of also being gay
B) gay men have fewer chromosomal pairs than straight men, while lesbians have larger areas of the hypothalamus than straight women
C) among adoptive pairs of brothers, if one brother is gay, the other brother has an increased chance of also being gay
D) parenting style influences adult sexual orientation for males but not for females

Question

Quizplus · Accepted Answer

Research has shown that there is a significant genetic component to sexual orientation, as evidenced by studies on identical twins where if one twin is gay, the other has a higher likelihood of also being gay compared to the general population.

The Genetic Influence on Sexual Orientation Has Been Supported by Research