Posted: May 06, 2016 3:25 pm
Keep It Real wrote:So an Australian twin study showed there is approximately a 20% concordance for monozygotic twins and homosexuality. Clearly the environment plays a large role in the development of sexual orientation. What factors are at play?
It's not clear, though. The womb is an environment, and twins share it. Environmental influences should, therefor, be expected to increase twin concordance and thereby confound any conclusions we can draw about the genetic influences for homosexuality based upon concordance data. It's a riddle, wrapped in an enigma, pressing on a bladder.