Twins and gay

Duration: 12min 24sec Views: 915 Submitted: 09.12.2020
Category: Brazilian
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. Identical twins sometimes have different orientations. For example, one may be straight while the other is gay.

Why Do Some Identical Twins Have Different Sexual Orientations?

Why Do Some Identical Twins Have Different Sexual Orientations?

One object is to report the number of concordant and discordant, monozygotic MZ and dizygotic DZ pairs observed. A second object is to examine the frequency of homosexuality in twins per se. One of the twin pairs was from a family deserving special attention. Among 14 siblings, there were three sets of male MZ twins. Two of these three sets of twins were concordant for homosexuality; in the remaining pair both twins were heterosexual.

Homosexual orientation in twins: a report on 61 pairs and three triplet sets

Dear Dr. Roach: I read your recent column regarding identical twins where one of the two was balding while his twin was not. Within my extended family, there are identical twin brothers, who also were almost impossible for family members to differentiate. As such, trying to identify a single cause of sexual identity, genetic or environmental, is not going to be successful.
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?