Chemical Switch Regulates Gayness?

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

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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.

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