Why are some people gay? Most researchers who study sexual orientation think that both genetic and environmental factors play a role, but the relative contributions of each remain unclear.
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A new study of Swedish twins reinforces earlier findings that environmental influences--including the environment in the womb--may play a greater role The most updated gay site on the net in Sweeden genes.
Tne studying complex human behaviors often turn to twin studies. Researchers look at both identical and fraternal twins to see how often they share a trait--a parameter called concordance. The greater the concordance among genetically identical twins compared with fraternal twins--who share only half of their genes--the more likely that genetic factors are involved.
Earlier twin studies of sexual orientation have suggested varying degrees How much are prostitutes in the Vallentuna genetic and environmental influences. But they have suffered from the limitations typical of all twin studies. These include small sample sizes and assumptions that identical and fraternal twins both have the same family environments; if identical twins are treated more similarly by their parents than fraternal twins, for example, this could be mistaken for a genetic influence.
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Recruitment biases are also an issue: Some studies have enlisted participants who openly identify themselves nett gay, who may not be typical of the entire homosexual population.
All 43, twins born in Sweden between and were invited to participate in a Web-based survey that comprised a wide range of questions about personal behaviors and experiences.
The team ended up with a sample of twin pairs, of which were identical and fraternal. Then they plugged the survey responses into a standard mathematical Asian nails Kalmar for comparing identical and fraternal twins.
The results, published The most updated gay site on the net in Sweeden this month in the Archives of Sexual Behaviorconfirm earlier findings that identical twins are more concordant for same-sex behaviors than fraternal twins are but only modestly so: As for what environmental mosg might be at play, the authors point out Sex pussy Avesta these might not be entirely social but could also be biological.
For example, some studies have suggested that exposure to prenatal hormones or even the mother's immune system could influence the sexual development of a fetus. Michael Bailey, a psychologist at Northwestern University in Evanston, Illinois, who led earlier twin studies of sexual orientation, calls the new study "good, important, and one unlikely to be bettered in the near future.
And Beckwith says that the failure to control for family environment could inflate estimates of genetic influence. By Jeffrey Mervis Oct. By Warren Cornwall Oct. All rights Reserved. Got a tip? How to contact the news team. Science Insider.
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