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The search for a "gay gene" may be off-target, new research finds. Another process called epigenetics that switches genes on and off may explain why homosexuality runs in families.
Epigenetics are heritable changes caused by factors other than DNA. Instead of traits getting passed down through the genes, epigenetic change happens because of the way genes are regulated, or turned on and off.
These genetic regulators may be the reason homosexuality persists in nature despite the fact that gay people are less likely to reproduce, suggests the new study published in the journal The Quarterly Review of Biology.

http://www.livescien...osexuality.html

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It raises a really interesting question.  If this switch can be manipulated at any point in life how would an individual choose?  To be or not to be - as the saying goes......