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>Humans aren’t particularly genetically diverse, given our dispersal, though as far as I know there’s some disagreement on _why_. That's absolutely correct. One set of hypotheses about this are population bottleneck theories[0]. As an example, the Toba Catastrophe Theory[1] posits that: "The Youngest Toba eruption has been linked to a genetic bottleneck in human evolution about 70,000 years ago,[28][29] which may have resulted from a severe reduction in the size of the total human population due to the effects of the eruption on the global climate.[30] According to the genetic bottleneck theory, between 50,000 and 100,000 years ago, human populations sharply decreased to 3,000–10,000 surviving individuals.[31][32] It is supported by some genetic evidence suggesting that today's humans are descended from a very small population of between 1,000 and 10,000 breeding pairs that existed about 70,000 years ago.[33][34]" Whether such theories are correct or not, they appear to fit with the lack of genetic diversity among humans. [0] https://en.wikipedia.org/wiki/Population_bottleneck [1] https://en.wikipedia.org/wiki/Toba_catastrophe_theory#Geneti... |