Is homosexuality genetic? It’s a long-running debate. This is an important question, because if this was proven (and accepted by lawyers and lawmakers), then discrimination against gays, such as state bans on gay marriage, would be ruled unconstitutional.
Now researchers say they’ve found a clue that may unlock the mystery. It lies in something called epi-genetics–how gene expression is regulated by temporary switches. They found that the transmission of sex-specific epi-marks may signal homosexuality.