Copy number variations are about 7 times more common than SNP variations, and also reflect racial groupings. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4568308/ …pic.twitter.com/9BIJdZMVwy
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Only africa is non clinal. The only african horner population is Somalis which appears to be intermediate on the deletion PC (fig 2a). If you look at Fig 1 you'll notice that Ethiopian, Eritrean, Yemen arab populations are all absent. It might look clinal if they were included
Is there some particular reason why we care about the clinal part here? Human variation is almost always clinal, just like the rainbow.
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