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Reflections on J. An investigative report by Lynn Conway. August 5,

A study of gay men in the US has found fresh evidence that male sexual orientation is influenced by genes. Scientists tested the DNA of gay men and found that genes on at least two chromosomes affected whether a man was gay or straight. A region of the X chromosome called Xq28 had some impact on men's sexual behaviour — though scientists have no idea which of the many genes in the region are involved, nor how many lie elsewhere in the genome.

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Sexual Orientation Sexual orientation is a scientifically important and fundamental human difference. Why some people are attracted to men, others to women, and others to both men and women is a fascinating and as yet unanswered question. Most men are primarily attracted to women, and most women are primarily attracted to men.

Scientists identify for the first time two specific genes that may foster a predisposition for being gay in men. Anyone choosing sides in the nature vs. But ina large study by J. One such variation was commonly found in the gene SLITRK6which is on chromosome 13 in the region of the brain, the diencephalon, containing the hypothalamus.

Skip navigation. InDean H. Hamer and colleagues in the US published results from their research that indicated that men with specific genes were more likely to be homosexual than were men without those genes.

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Bailey, Cochran and Sailer on Homosexuality and Eugenics. All rights reserved [Draft Version of ]. Both groups abhor the idea that society could change so as to include and accommodate GLBT people.

Sexual orientation of relatives was assessed either by asking relatives directly, or when this was impossible, asking the probands. Heritabilities were substantial under a wide range of assumptions about the population base rate of homosexuality and ascertainment bias. However, the rate of homosexuality among nontwin biological siblings, as reported by probands, 9.

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In the Aug. In a large study of more thanmen and women in the United States, United Kingdom and Sweden, researchers discovered four genetic variants that occur more often in people who indicated on questionnaires that they had had same-sex sexual partners. The other two influence sex partner choice for both men and women.

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He is best known among scientists for his work on the etiology of sexual orientationfrom which he concluded that homosexuality is substantially inherited. According to the Web of ScienceBailey's works have been cited nearly times and he has an h-index of Bailey was born in Lubbock, Texas.

A genetic analysis of gay siblings supports the idea that genes on the X chromosome contribute to male homosexuality. Dean Hamer finally feels vindicated. But several subsequent studies called his finding into question.

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