Topic: Sex
Survival of genetic homosexual traits explained
00:01 13 October 04
NewScientist.com news service
Italian geneticists may have explained how genes apparently linked to male homosexuality survive, despite gay men seldom having children. Their findings also undermine the theory of a single "gay gene".
The researchers discovered that women tend to have more children when they inherit the same - as yet unidentified - genetic factors linked to homosexuality in men. This fertility boost more than compensates for the lack of offspring fathered by gay men, and keeps the "gay" genetic factors in circulation.
The findings represent the best explanation yet for the Darwinian paradox presented by homosexuality: it is a genetic dead-end, yet the trait persists generation after generation.
"We have finally solved this paradox," says Andrea Camperio-Ciani of the University of Padua. "The same factor that influences sexual orientation in males promotes higher fecundity in females."
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