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S.O.Y. Keita on POLYTOPICITY
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[QUOTE]Originally posted by lamin: [QB] People who bred dogs can certainly do a "convergent" evolution experiment--albeit an artificial one by "back-breeding" a Chow back to the original Wolf. That would be convergent evolution. Are people of Melanesia examples of "convergent evolution"? Not really. It's more like "consistent evolution" with migrant groups maintaining parent traits over many millennia simply on the fact that the environments that they migrate to are ecologically similar. But because of the huge time time difference with their MRCA--many mutations take place thereby lending to the argument that such groups are not "genetically related" though phenotypically similar. The confusion arises because people assume that there is something materially specific about the 4 nucleotide bases ATCG. When mutations occur--all that happens is a minor shuffling of the order and frequency of those 4 bases. But in reality, what ultimately counts in nature is the selective impact of the environment on the living organism--genetic drift, bottle-necking, assorted mating, environmental isolation--thereby lending to new types, selected mating based on mere contingent aesthetics, etc. The main thing about genotype analysis is that it mainly tells us about "separation times" and MRCA. So do the Melanesians fall within the "African" ambit? Well yes. Proof of the Pudding: I have seen Fijian rugby teams play African teams from Kenya, Namibia, and South Africa. When they play Kenya and Namibia I can hardly tell the difference--same running styles and physiques combined with physiognomy and hair. Point: the idea is NOT Africa-per se, but the PEOPLE who have evolved there. [/QB][/QUOTE]
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