Because there is similar DNA to different races only emphasizes that fact that we are all human. It should be noted though, that we all share some DNA with frogs and chimpanzees too, so guessing what degree of similar DNA means what degree of kinship is dangerous, until we get the DNA fully and reliably decoded. So far, this science is still in its infancy.
They do not say when the obvious differentiation started to take place in any convincing way. I have my doubts about a mere 50,000 years though. Nomadic Indid races of North America started to colonize perhaps 30,000 years ago, and they were already recognizably skeletally differentiated. Some races of so-called "Aryans" or Indo-Europeans, colonizing Europe, began incursions about 25,000 years ago, and DNA echoes of their ancestry can be seen in modern Europeans. Cro-Magnon was found perhaps only 100,000 years ago.
For these scientists to say that there is no genetic basis for race is ludicrous. For one thing, racial characteristics are conferred by parentage, so what is that if not genetic? Obviously racial characteristics are differentiation that is based on selection influenced by environment, particularly thermodynamics. Darker skin colour, with more pores and skin area, as found in Africans and Asians, is more able to regulate temperature in hot environments. (From Physics Theory of Black Body radiation -- Gibbs..) Lighter skin with more cilia and fewer pores, which absorbs low-sun angle UV, can store heat for colder environments. This can only be gene selected, as Darwin pointed out. It is merely political correctness that leads people to stick their heads in the sand and say that differentiation is not for a reason, and therefore insignificant. Chance differentiation does not exist, as it is without purpose. No influence on a living thing can be met without purposeful adaptation. All features of biota are purposeful and adaptive, not vestigial.
I agree, however, that survival characteristics are advantage-conferring and some of the chiefest advantages needed for survival are adeptness and foresightedness. In this we can be politically correct and say surviving species adapted with cleverness and not mere fecundity.
It may not be true, as has been demonstrated with EEG test on Italian groups, that all races think in the same way. Thinking patterns due to extremes in environment may have favoured different skill sets in different groups. This has long been noted by anthropologists. The Italian studies noted a different degree of brain area activation in problem solving tests. It may explain why some Italian scientists tended to me multi-faceted and generalists.
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