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OUT-OF-AFRICA, the peopling of continents and islands: tracing uniparental gene trees
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[QUOTE]Originally posted by lamin: [QB] [QUOTE][b]Here is an example of an OOA map The topic is the route of migrants coming out of Africa naturally an Out Of Africa map is not focused on prior In-Africa population movements [/b][/QUOTE]. I said that the map and orientation is Eurocentric because the human geographic delineation of the continents is purely arbitrary. What is so special about humans crossing over to the Asian sub-continent. Did they know where they were going? No!. So to complete the picture and to give an objective scientific statement it would be better if the the movements within Africa for 160,000 years plus were also shown. The movements from East Africa to West Africa and Southern Africa are just as important as a move from East Africa to Central Asia. [QUOTE][b]Melanesia was also settled around this time, probably by individuals from East Asia. Although Melanesians today resemble certain African groups, they turn out to be genetically far removed from Africa.[/b][/QUOTE]Wrong analysis: Genetic differentiation tells us nothing more than the amount of time that some group A has separated from group B. A single group can split into 2 groups A and B for a sufficiently long time period so that the STR polymorphisms--i.e. the arrangements of the bases CTGA--are strongly disparate. But the 2 groups maintain the same phenotype because the environment in which they survive are almost identical. And that's exactly my point: the Melanesians, Andaman Islanders and Africans are phenotypically alike because the OOA Melanesians and Andaman Islanders [b] retained[/b] the phenotypical traits they left Africa with. So, for example, are Fijians Africans in the phenotypcal sense of the term--which is all that really counts in the social world? It would seem so. I have seen Fijians play rugby--they very good at it--and their power, speed, and musculature equates that of West Africans. Note that what is central in the analysis is the [b] environment[/b]. Change the environment and you could minimally change the STR polymorphisms but maximally change the phenotype. Keep the same environment but separate the groups for a relatively long time--time enough for mutations to rearrange the ACGT bases--and you have phenotypic homology but great genomic disparity. [/QB][/QUOTE]
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