Gay male twins over 40

Most of us believe that we were born that way, but is sexual orientation in our DNA? JV Chamary goes in search of the gay gene. By Jv Chamary. Volunteers from over families responded. Researchers asked them questions about their sexuality, the size and structure of their families, and took DNA samples. The region also goes by another name: GAY-1, a genetic marker linked to male homosexuality.
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Largest study of gay brothers homes in on 'gay genes'

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Gay genetics - BBC Science Focus Magazine

A new study of twins provides the strongest evidence yet that homosexuality has a genetic basis, researchers say, though they say other factors like social conditioning may be important. The study, published in the December issue of The Archives of General Psychiatry, adds to evidence that sexual orientation does not result from a maladjustment or moral defect, one author said. Michael Bailey, an assistant professor of psychology at Northwestern University in Evanston, "which is exactly the kind of pattern you would want to see if something genetic were going on. Bailey was referring to brothers by adoption. The study examined 56 identical twins, 54 fraternal twins and 57 adoptive brothers recruited through advertisements in gay-interest publications. Identical twins are genetic clones, having developed in the womb from a single egg that split after being fertilized by a single sperm.
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Homosexual orientation in twins: A report on 61 pairs and three triplet sets

A genetic analysis of pairs of gay brothers, including sets of twins, has provided the strongest evidence yet that gay people are born gay. The study clearly links sexual orientation in men with two regions of the human genome that have been implicated before, one on the X chromosome and one on chromosome 8. The finding is an important contribution to mounting evidence that being gay is biologically determined rather than a lifestyle choice. The region on the X chromosome picked out by the study, called Xq28, was originally identified in by Dean Hamer of the US National Institutes of Health in Bethesda, Maryland, but attempts to validate the finding since have been mixed. The other region picked out is in the twist in the centre of chromosome 8.
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The relationship between biology and sexual orientation is a subject of research. While scientists do not know what determines an individual's sexual orientation , they theorize that it is caused by a complex interplay of genetic , hormonal , and environmental influences. Biological theories for explaining the causes of sexual orientation are favored by scientists.
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