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BigBadWlf
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Actually it does show a genetic link. Even in identical twins there is not 100% correlation among features we know to be genetically based. Eye color for example is only 98% correlated in identical twins. The twin studies done with lesbian and gay men have produced some of the highest such colorations known.http://www.tim-taylor.com/papers/twin_studies/studies.html
I'm rather puzzled at the posts. I attended the University of Minnesota that did a lot of the Twin Studies in regards to homosexuality. The research does not "clearly" show that there is no natural link, but rather, through showing the probability that if one twin is gay, the other is 50% like to also be gay. They have researched this with twins raised apart AND raised separately.
Does that prove that homosexuality is genetic. No. That would be 100%. However, 50% does indicate that there is SOME genetic element.
What has been found is that having a gene and your body expressing that gene are two different things. The key player here is the epigenome. The epigenome is a collection of molecules that are wrapped around DNA, these molecules turn genes on and off and subtly change over time. This is why even identical twins are not completely identical. The effect of the epigenome may explain one of the puzzling mysteries of sexual orientation: the fact that the biggest predictor of homosexuality (in males) is having older biological brothers, It should be noted that this is biological, not social. Adoptive older brothers have no such effect.
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