Are fraternal twins more likely to be gay

by Justin Lehmiller. A growing amount of research suggests that sexual orientation has a genetic basis. In fact, scientists recently identified two specific genes that appear to differ between gay and straight men [1]. If sexual orientation is indeed genetically determined, it would be tempting to assume that identical twins would always have the same orientation, right?

A growing amount of research suggests that sexual orientation has a genetic basis. In fact, scientists recently identified two specific genes that appear to differ between gay and straight men [1]. If sexual orientation is indeed genetically determined, it would be tempting to assume that identical twins would always have the same orientation, right? If they have the exact same genes and our genes control our sexuality, this would seem like a pretty logical conclusion.

hajile on Feb 8, parent context favorite on: The largest study to date on the genetic basis of Identical twin studies point away from genetics very hard. drocer88 on Feb 8, next [—]. From the link: "Research from the s2 showed that identical twins are more likely to share a sexual orientation than are fraternal twins or adopted siblings.

Brendan Zietsch receives funding from the Australian Research Council. He is senior author on the paper discussed. University of Queensland provides funding as a member of The Conversation AU. What has been elusive is knowledge of what specific gene, or genes, are involved.