Since I was talking to @CovfefeAnon about whether "race" is a binary category or a smooth manifold, I thought it would be interesting to do a thesis-antithesis-synthesis in pictures.
Thesis:pic.twitter.com/hqEBmNmOBg
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I think that's the most important factor. Mixing with archaic hominids is specific to region and results in DNA independent from other regions.
Mixing with different species of archaic hominids and being under drastically different selective pressures go together. One jump-starts with an infusion of different adaptations, the other selects on the results.
The fst distance is the same as some animal groups universally regarded as different species (wolves / coyotes) and greater than others regarded as different species (species of gorilla, chimps / bonobos, etc.)pic.twitter.com/EAUuMgkp27
Now, interbreeding is possible between human species but that's the case for many separate species and doesn't imply a continuum between the species if there was no historical range where there was a smooth transition from one species to another.
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