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.
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