DNA variants linked to gay sex also appear more in straight men w larger number of partners & w greater attractiveness. Variants may “confer a mating advantage to straight carriers” which helps explain evolutionary persistence of gayness. https://www.technologyreview.com/s/611946/genes-linked-to-being-gay-may-help-straight-people-get-more-sex/?utm_campaign=social_button&utm_source=twitter&utm_medium=social&utm_content=2018-10-18 … | @techreview
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Selection for homosexuality need not be stabilizing for homosexuality to exist. In fact, the most plausible scenario is runaway selection on a correlated trait.
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That's not stable unless the rg=1, which is absurd.
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If you have two genetically correlated traits which are rg<1, one of which is very unfit and one which is fit, eventually the selection pressure will dissociate them. (Not that anyone has ever measured any kind of such rg in the first place or seen signs of it...)
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Suppose there is a wildtype AA and extremely fit heterozygote Aa. The Aa is undergoing very strong selection. However, "aa" happens to be sterile. As a result, we have runaway selection on Aa which maintains population of unfit aa.
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That's not an rg between traits, is irrelevant to a known highly polygenic trait like homosexuality, and in such a case of heterozygote advantage there will eventually be modifiers or variant alleles to get the Aa advantage without the aa fitness penalty.
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Yes, that's not an rg. However it's an example of a situation that's very difficult to "disassociate" for natural selection. Of course eventually there will be modifiers. Yet Sickle Cell persisted for how long with an disadvantageous phenotype?
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Only ~10kya, IIRC. Homosexuality has probably been around way longer.
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