Max Planck Institute recent finding concludes that humans who live outside of Africa have 1-4% of Neanderthal DNA and that those who live in Africa are 100% from Homo-sapiens.
Things seems to be a little clearer now, this is how I see it:-
It all makes sense when you consider that the genome difference between humans and chimpanzees were found to be around 1% and then later revised 10x to around 10%.
Basically humans vary so much in skin colour and body traits all around the world. For such a configuration to happen there should have been 'extremes' and then a blend among these 'extremes'. Think of it like a black & white TV set. It displays black, white and different shades of grey.
On one hand you have the Neanderthal in the icy european north with bright blue eyes, fair skin and straight hair and on the other hand you have the Homo-sapiens in hot central Africa with dark eyes, black skin and coiled hair. Then at some point in time the two species co-existed at a converging area most probably the middle-east, they interbred to give birth to the early human explorers.
The new breeds explored different parts of the world at different time intervals (10,000 years) and their respective climate sculptured what we now know as babylonians, persians, indians, chinese or even aboriginal Australians. My guess is the further north the region is, the greater the Neanderthal DNA content. Therefore I would say that Europe & Russia have a 4% Neanderthal DNA content, Mongolia & China 3%, India 2%, Australian Aboriginal 1%, Africa & Madagascar 0%.
Note the skin colour variation from white in Europe & Russia (4%) to black in Aboriginal Australia (1%). Perhaps our skin colour is determined within the 4% Neanderthal DNA that we may have. 4% is huge compared to the initially thought 1% DNA difference between human and chimps.
Note: Im no scientist, the above is just the big picture as i see it with all the possible inaccuracies.
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