Gay Genes In Identical Twins

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The relationship between biology and sexual orientation is a subject of research. A simple and singular determinant for sexual orientation has not been conclusively demonstrated; various studies point to different, even conflicting positions, but scientists hypothesize that a combination of genetic, hormonal, and social factors determine sexual orientation.



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The subject of identical twins has been on my mind ever since I read a magnificently creepy thriller called Ice Twins by SK Treymayne — a pseudonym meant to sound like a woman, but it fact belonging to the novelist Sean Thomas. Lydia and Kirstie are monozygotic twin seven-year-olds i.



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The biological influences on sexual orientation may extend to DNA 'tags' that affect gene expression. Update, 12 October



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For men, new research suggests that clues to sexual orientation may lie not just in the genes, but in the spaces between the DNA, where molecular marks instruct genes when to turn on and off and how strongly to express themselves. Ngun reported that in studying the genetic material of 47 pairs of identical male twins, he has identified "epigenetic marks" in nine areas of the human genome that are strongly linked to male homosexuality.



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Interview highlights, from the NPR Shots blog If you take identical twins, male twins, the chances that these male twins will share a sexual orientation is much higher than siblings, for instance.

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Not a lifestyle thing, but specific gay genes remain to be pinned down Image:

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