Is gay genetic or environmental
Please refresh the page and retry. G enes play just a small role in whether a person is gay, scientists have found, after discovering that environment has a far bigger impact on homosexuality. In the biggest ever study into the genetic basis of sexuality, researchers from more than 30 institutions including Cambridge University and Harvard , looked at the DNA of nearly , people in Britain and the US. They found that genes are responsible for between eight to 25 per cent of the probability of a person being gay, meaning at least three quarters is down to environment.
What do the new ‘gay genes’ tell us about sexual orientation?
What do the new ‘gay genes’ tell us about sexual orientation? | New Scientist
A new study suggests many genes, each with small effects, may play a role in same-sex sexual behavior. People who have had same-sex partners are more likely to have one or more of certain DNA markers, according to the largest ever search for genes linked to sexual orientation. Even all the markers taken together, however, cannot predict whether a person is gay, bisexual, or straight. Instead, hundreds or thousands of genes, each with small effects, apparently influence sexual behavior. The paper, published today in Science , builds on results presented by the same team at a meeting. The published study emphasizes that the genetic markers cannot be used to predict sexual behavior. Still, the work is being hailed as the most solid evidence to date linking specific genetic markers to same-sex sexual behavior.
Biology and sexual orientation
By studying the DNA of more than , people in the United States and United Kingdom, scientists have determined that there is no single "gay gene. Previous research has indicated that same-sex preferences are determined -- at least in part -- by a person's genes, and the idea of a single "gay gene" was born in when researchers identified a correlation between gay male sexuality and a genetic marker called Xq As society embraced the concept of a gay gene, some took comfort in the idea that some people are "born gay," while others worried this might create the false impression that homosexuality is an aberrant pathology. But the new study, published today in the journal Science , finds that same-sex sexual preferences cannot be attributed to a single gene -- or even a small handful of genes.
It is not a new finding that variation in complex traits such as human sexual behaviour is caused jointly by effects of environmental factors and many genetic variants with small effects, distributed across the genome Editorial , 31 August. This principle has been understood for many such traits for more than years. Work using modern genomic methods in organisms from fruit flies to humans, such as the study referred to in the editorial, strongly confirms it.