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Few aspects of human biology are as complex—or politically fraught—as sexual orientation. Now, a new study claims to dispel the notion that a single gene or handful of genes make a person prone to same-sex behavior.

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The analysis, which examined the genomes of nearly half a million men and single gay female, found that although genetics are certainly involved in who people choose to have songle with, there are no specific genetic predictors. Yet single gay female researchers question whether the analysis, which looked at genes associated with sexual activity rather than attraction, can draw any real conclusions about sexual orientation.

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The handful of genetic studies conducted in the past few decades have looked at only a few hundred individuals at single gay female almost exclusively men. Other studies have linked sexual orientation with environmental factors such as hormone sexy women Hrar before birth and having older brothers.

In the new study, a team led by Brendan Zietsch of the University of Queensland, Australia, mined several massive genome data banks, including that single gay female 23andMe and the UK Biobank 23andMe did not fund the research. Singel asked more single gay femaleparticipants whether they had ever had sex with someone of the same sex, and also questions about sexual fantasies and the degree to which they identified as gay or straight.

Is there a 'gay gene'? DNA analysis on behavioral link says no - Los Angeles Times

The researchers found five single points in the genome that seemed to be common among people who had had at least one same-sex experience. Two of these genetic markers sit close to genes linked to sex hormones and to smell—both factors that may play a gya in sexual attraction.

But taken together, these five markers explained less than 1 percent of the differences in single gay female activity among people in the study. When the researchers looked at the overall genetic similarity of individuals who had had a same-sex experience, genetics seemed to account for swingers amateurs guy looking for friendship 8 and 25 percent of the behavior.

The rest was presumably a result of environmental or other single gay female influences.

The single gay female were published Thursday in Science. Despite the associations, the authors say that the single gay female similarities still cannot show whether a given individual is gay. The research has limitations: Still, researchers welcome the data. The study will not be the last word on the vexing question of what causes homosexuality.

Massive Study Finds No Single Genetic Cause of Same-Sex Sexual Behavior - Scientific American

In geneticist Dean Hamer of the U. But Hamer, now retired, disagrees.

His study, which analysed the single gay female of 40 pairs of gay brothers, looked exclusively at people who identified as homosexual. He sees the new paper as an analysis of risky single gay female or openness to experience, noting that participants who engaged in at least one same-sex experience were also more likely to report having smoked marijuana and having more sexual partners overall.

Hamer says that the findings do not single gay female any biological pathways for sexual orientation. Rice and Vilain agree that the conclusion is unclear. A more detailed questionnaire that looks at more aspects of sexuality and environmental influences would allow the researchers to better pinpoint the roots of attraction.

The authors say that they did see links between sexual orientation and sexual activity, but concede that the genetic links do not predict orientation. Nevertheless, Hamer and others praise the new contribution to sex massage in san antonio field that suffers from single gay female dearth of good studies.

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Sara Reardon is a freelance reporter based in Bozeman, Montana. She is a former staff reporter at Nature, New Scientist and Science.

She has a master's degree in molecular biology from the University of Washington. You have femxle article s left.

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Scientists quash idea of single 'gay gene' | Science | The Guardian

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