Dean Hamer finally feels vindicated. By using this site, you agree to the Two of the sibs are gay of Two of the sibs are gay and Privacy Policy. For instance, identical twin brothers siblings derived from the same fertilised egg are more likely to both be gay than fraternal twins twins that develop from separate eggs.
When comparing bits of DNA from two brothers, the sequences will, on average, be the same 50 per cent of the time. After statistically controlling for number of older brothers, homosexual and heterosexual males do not differ in their mean number of older sisters, younger sisters or younger brothers.
The region also goes by another name: GAY-1, a genetic marker linked to male homosexuality.
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Sanders will then use sequences from databases like the Human Genome Project to pinpoint which genes are in these regions. For instance, identical twin brothers siblings derived from the same fertilised egg are more likely to both be gay than fraternal twins twins that develop from separate eggs.
CNN If you're a guy with an older brother, there's an increased chance you're gay. Archives of Sexual Behavior. However, direct comparison of the magnitudes of these two effects showed that the fraternal birth order effect took precedence in the studies.
Instead, researchers found a correlation between such unions and having an excess of older sisters.