Identical twins one gay

Twin studies[ edit ] A number of twin studies have attempted to compare the relative importance of genetics and environment in the determination of sexual orientation. Self reported zygosity , sexual attraction, fantasy and behaviours were assessed by questionnaire and zygosity was serologically checked when in doubt. Other researchers support biological causes for both men and women's sexual orientation. Women showed a statistically non-significant trend to weaker influence of hereditary effects, while men showed no effect of shared environmental effects.
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Homosexual orientation in twins: a report on 61 pairs and three triplet sets.

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One gay, one straight: how identical twins feel about their different sexualities | SBS News

Share this article Share But looking back at the images taken of Rosie Ablewhite, a portrait artist who has a girlfriend, Alex, 25, and her twin Sarah Nunn, a copy writer, who married Rick, 35, a creative director for a technology company two years ago, the differences between them were noticeable from a young age. For example, when, at six, Sarah put on a pretty dress and princess shoes to play with her dolls, her sister preferred action figures and a Batman suit. And at eight, when Sarah dressed up as Wilma from the Flintstones for a party, Rosie opted to be her husband, Fred. These early preferences may have had little significance, were it not for the divergent paths the sisters took during adolescence.
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Science Says: This Is Why You're Gay

Share on Twitter Douglas Ever since we were young, we were inseparable; but always competitive and trying to be different at whatever we did. From athletics to soccer and school, we were the same but very different. We feel this has never really changed as we have grown up.
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By Melissa Healy Oct 08, New research identifies epigenomic "marks" linked to homosexuality. But experts say the origins of partner preference remain a mystery.
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