Why some people are gay: New study claims trait is passed from mothers to sons and from fathers to daughters

Why some people are gay: New study claims trait is passed from mothers to sons and from fathers to daughtersNew study answers puzzle of why homosexuality seems to run in familiesIt would not be expected to persist given Darwinian natural selectionResearchers show it is an epigenetic rather than a genetic trait | UPDATED: 14:26 GMT, 12 December 2012 Homosexuality is passed down through the generations from mother to son and from father to daughter, a new study claims. From an evolutionary standpoint, homosexuality is a trait that would not be expected to develop and persist in the face of Darwinian natural selection. It is nevertheless common for men and women in most cultures and previous studies have shown that homosexuality runs in families, leading most researchers to presume a genetic underpinning of sexual preference.