Chemical Switch Regulates Gayness?

New research suggests homosexuality may come from the chemical switches attached to genes rather than the DNA itself

Gayness may not be in our genes, but in the molecules that regulate them. New research suggests that epigenetic factors -- chemical "switches" attached to genes that turn them on or off -- are a more plausible heritable mechanism behind homosexuality than DNA itself.

Non-genetic changes to gene expression are called epi-marks, for epigenetics, the field of research dealing with the molecular on/off switches. Epi-marks are normally erased between generations, but there's recent evidence that they're sometimes passed from parent to child.