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And I am three for three! I am a prediction machine.
Well since the user is now (once again pretending to) having me on ignore I can certainly explain to the OTHER users why his claim is absolute and complete tosh.
Here are the reasons why homosexuality is not, and would not, be an evolutionary dead end:
1) Firstly for it to specifically be an evolutionary dead end there would have to specifically be a gene FOR homosexuality. The claim that homosexuality is genetic is however not predicated on there being a gene FOR homosexuality however. The genetic claims for homosexuality are predicated solely on genes we KNOW WE ALREADY HAVE.
2) For homosexuality to be an evolutionary dead end for a species, one of the MANY requirements would be that a significant quantity of individuals would have to be homosexual. But homosexuality is not statistically significant enough at all. In fact if you TREBLED it over night it still would not be.
3) For it to be an evolutionary dead end, EVEN IF it was statistically significant and EVEN IF there was specifically a gene for it....... you would ALSO have to assume that homosexuals do not reproduce. This is ALSO nonsense because many of them do through direct partnerships and surrogacy. Because, get this shocker, homosexuality is about who one is attracted to, not who one reproduces with.
4) FURTHER the assumption of it being a dead end assumes that the gene dies with an individual that does not reproduce. This is also not so as quite often genes that die in one individual succeed in that individuals siblings. So evolution would be NEUTRAL to the trait at best. But actually if the homosexual individual conferred ANY advantage ON those siblings then homosexuality would be selected FOR not against. Because, unlike what evolutionary lay men like nj above might thing, genes move through populations not individuals.
5) And the last complete torpedo to NJs nonsense is that nature is REPLETE with examples of genetic non-reproduction that is NOT an evolutionary dead end. For example the genetics that cause non-reproduction in the vast majority of hive species (say wasps in insects or mole rats in mammals for example) are not evolutionary dead ends and survive from generation to generation over MANY MANY generations. Were NJs little narrative to be in any way true, this would not be so. But, unlike his fantasy world, out here in reality the existence of genes that cause individuals not to reproduce are anything but evolutionary dead ends.