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Identical twins one gay one straight

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    But experts say the origins of partner preference remain a mystery. 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. That news, presented at the meeting of the American Society of Human Genetics on Thursday, may leave the genetically uninitiated scratching their heads. Through the epigenome, the results suggest, some facet of life experience likely also primes a man for same-sex attraction. But they increasingly suspect it is forged, in part, by the stresses and demands of external influences.
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    Homosexual orientation in twins: a report on 61 pairs and three triplet sets

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

    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.
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    One gay, one straight: how identical twins feel about their different sexualities

    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.
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