(ANSA) - Milan, August 30 - An Italian-led research team has
found that homosexuality is caused by a "rainbow" combination of
DNA and environmental factors, in the biggest ever research
project on the issue in the world.
There is not one single gene that permits a prediction of
sexual leanings, the study said, but thousands of genetic
variations that make a "limited" contribution with respect to
the influence of the environment and culture one grows up in.
The largest ever genetic study of the topic, published in
SCience, was conducted on half a million people by an
international team led by Italy's Andrea Ganna, of the Broad
Institute at Harvard.
Gayness due to DNA, environment rainbow
Not one gene alone says world' biggest ever study