A new study that analyzed the DNA of nearly half a million people has found that while genetic differences play a significant role in sexual preference, there is no single gene responsible.
. This gave them an overall sample size of 477,522 people, 26,827 of whom reported same-sex sexual behavior.
Using a different analytical technique, the scientists found that when taking into account all of the subtle influences of many, many markers across the genome that they did not specifically identify, genetics could potentially account for up to 8% to 25% of the population’s same-sex behavior. That’s because, in all likelihood, a huge and currently unknown number of genetic markers likely play infinitesimally tiny roles in shaping behavior, Neale said.
That finding “makes a certain amount of sense,” Neale said, “but again, we don’t have much more to say beyond that sort of high-level description.” Exactly which environmental and cultural factors play a role is unclear, because those are varied and complex and are much harder to pin down and study than specific genetic markers, the study authors said.
In this respect, the researchers found, genetics had a stronger influence on same-sex behavior in men than in women. The scientists were quick to point out that the findings were population-based and could not be applied on an individual level. They also warned that the work should not in any case be used to try to “convert” people who engage in same-sex behaviors, and that to consider doing so would be a gross misrepresentation of the study’s findings.
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