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The counterargument there is that the Chinese are probably descended from the Yellow River Ghost Population, i.e. a more northerly, cold winters group, who expanded south
Southern and Northern Chinese look really different to me though. Don’t know when that would’ve happen but must’ve happened some time ago as they seem to have diverged.
South Chinese probably have some admixture with aboriginal groups as they expanded southward. That's a common pattern in history.
North Chinese doubtless have more admixture from the steppes and Manchuria on the other hand.
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