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Honestly, I can't say that there isn't some epigenetic factor that has contributed to development in ratcheting over the past 10,000 years, but it seems that a persons ability to continue this process is more dependent on socio-cultural factors, as opposed to ancestry. But there will probably need to be a lot of research to make the case that epigenetics played a role. Personally, I don't think it's possible that it played a larger role than environmental factors. How do you suppose you could test for that?