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gwern's profile
gwern
gwern
gwern
@gwern

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gwern

@gwern

Writer, independent researcher, Internet 𝘣𝘦𝘴𝘴𝘦𝘳𝘸𝘪𝘴𝘴𝘦𝘳

Present day. Present time. (Ahahaha!)
gwern.net
Joined November 2008

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    1. Nicholas A. Christakis‏ @NAChristakis Oct 18

      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

      13 replies 61 retweets 140 likes
    2. Year Zero‏ @yearzero9 Oct 18
      Replying to @NAChristakis @razibkhan @techreview

      Is this the replacement for the gay uncle hypothesis? 🙄

      1 reply 0 retweets 0 likes
      gwern‏ @gwern Oct 18
      Replying to @yearzero9 @NAChristakis and

      Pretty much. It's still hard to see how a small increase in 'attractiveness' can possibly compensate for big fitness hits like having a gay son such that there really is stabilizing selection for homosexuality.

      12:26 PM - 18 Oct 2018
      • 1 Retweet
      • 5 Likes
      • Wandering Learner Tequehead DM Berger 🧟‍♂️Monster von Mutant🦑 Wyndham Churl
      1 reply 1 retweet 5 likes
        1. New conversation
        2. After Sol‏ @Locus_of_Ctrl Oct 18
          Replying to @gwern @yearzero9 and

          Selection for homosexuality need not be stabilizing for homosexuality to exist. In fact, the most plausible scenario is runaway selection on a correlated trait.

          2 replies 0 retweets 0 likes
        3. gwern‏ @gwern Oct 18
          Replying to @Locus_of_Ctrl @yearzero9 and

          That's not stable unless the rg=1, which is absurd.

          1 reply 0 retweets 0 likes
        4. After Sol‏ @Locus_of_Ctrl Oct 18
          Replying to @gwern @yearzero9 and

          ?

          1 reply 0 retweets 0 likes
        5. gwern‏ @gwern Oct 18
          Replying to @Locus_of_Ctrl @yearzero9 and

          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...)

          1 reply 0 retweets 1 like
        6. After Sol‏ @Locus_of_Ctrl Oct 18
          Replying to @gwern @yearzero9 and

          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.

          1 reply 0 retweets 1 like
        7. gwern‏ @gwern Oct 18
          Replying to @Locus_of_Ctrl @yearzero9 and

          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.

          1 reply 0 retweets 1 like
        8. After Sol‏ @Locus_of_Ctrl Oct 18
          Replying to @gwern @yearzero9 and

          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?

          1 reply 0 retweets 1 like
        9. gwern‏ @gwern Oct 18
          Replying to @Locus_of_Ctrl @yearzero9 and

          Only ~10kya, IIRC. Homosexuality has probably been around way longer.

          1 reply 0 retweets 0 likes
        10. 4 more replies

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