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By Sebastian Murphy-bates For Mailonline. Scientists searching for the root of human sexuality studied identical twins, one of them straight and the other a lesbian, who grew up in the same environment.



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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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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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A new study of gay twins has provided the strongest evidence to date that people are born gay. Analyzing genetic markers of pairs of non-identical gay twins, researchers at NorthShore Research Institute in Evanston, Illinois, clearly linked male homosexuality with two regions of the human genome, one on the X chromosome and one on chromosome 8.



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Please refresh the page and retry. H omosexuality may be triggered by environmental factors during childhood after scientists found that genetic changes which happen after birth can determine whether a man is straight or gay.



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If index cases for a particular trait e. It is assumed that the environment in which each member of a twin pair is reared is virtually identical, as twins are identical in age, and tend to have very similar experiences during childhood e.

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Eight major studies of identical twins in Australia, the U.

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