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    By Andy Coghlan. Not a lifestyle thing, but specific gay genes remain to be pinned down. 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.
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    Gay Men in Twin Study

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    'Three Identical Strangers' Is A Tragic Masterpiece. As A Triplet, It Hurt To Watch | The ARTery

    The second of these may also have implications for why some women respond better than others to in vitro fertilization. Unlike identical twins—who are genetically the same—fraternal twins are no more closely related in terms of DNA than regular siblings. But scientists often like to compare identical and fraternal twins to understand how much variation in a trait is due to environment versus genetics. Because of that, several large databases track twins as they age. In , a young behavioral geneticist at Vrije Universiteit in Amsterdam named Dorret Boomsma started the Netherlands Twin Register, which now contains more than 75, twins, triplets, and other children of multiple births.
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    Having fraternal twins is in your genes—and in your hormones

    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.
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    Editor's Note: This essay includes some information about "Three Identical Strangers" that is not revealed until late in the documentary. The documentary begins like a real-life version of "The Parent Trap. He is instantly mistaken for a popular look-alike named Eddy, who had dropped out the year prior, and greeted with high-fives and kisses from complete strangers. Bobby asks if he is speaking to Eddy.
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