The time-frames involved are enormous. 10,000 years isn't nearly long enough, civilization/history as we know it is only about 6,000 years old and we can just trace monolithic construction and agriculture to 12,000 years ago, – H. Sapiens has been a distinct species for 200,000 years. read more
As a sub-species Homo Sapiens Sapiens is 45,000 old, give or take a few thousand years. The species could split if two populations become isolated for long enough, or transition if the population was radically reduced. Either way it would take 100–200,000 years to fully speciate. read more
Since this gene is thought to have originated more than 200,000 years ago, it undercuts the claim that an African population of modern Homo sapiens replaced East Asian archaic humans less than 6 0,000 years ago. Regional Continuity Model Arguments. Fossil evidence also is used to support the regional continuity model. read more
From there Homo sapiens spread out across the globe. By 10,000 years ago modern humans had successfully colonized each of the continents save Antarctica, and adaptations to these many locales (among other evolutionary forces) led to what we loosely call races. read more