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This pattern of inheritance suggested that there might be linked genes on the X chromosome , since males always inherit their copy of the X chromosome from their mothers. While the mechanisms here aren't fully understood, the researchers explain the SLITRK gene family is important for neurodevelopment and could be of relevance for a range of behavioural phenotypes, not just sexual orientation. Published online Sep National institute of mental health task force on homosexuality: Homosexuality and bisexuality in different populations. Get ScienceAlert stories delivered to your inbox. Other research has found that among identical twins where one brother is gay the likelihood of the other brother also being gay is much greater than the incidence of homosexuality in the general population.
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Scientists find DNA differences between gay men and their straight twin brothers


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The Truth about the “Gay Gene” - Innovation


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Is the ‘Gay Gene’ a Myth? Scientists Say Homosexuality Impossible to Determine by DNA

To find the epigenomic markers of male homosexuality, Ngun, a postdoctoral researcher at UCLA's Geffen School of Medicine, combed through the genetic material of 47 sets of identical male twins. In terms of the new results, there's bound to be a lot of interest in the study, but the researchers are eager to emphasise their findings are largely speculative for now, since there's still a lot we don't know about what these genetic variations really mean. That news, presented at the meeting of the American Society of Human Genetics on Thursday, may leave the genetically uninitiated scratching their heads. A study by Allen and Gorski examined the anterior commissure of the brain, finding that females and homosexual males exhibited a larger size than heterosexual males.
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