Why is it theorized that humanity evolved from where it did and not somewhere else in the world?

All homo sapiens DNA traces back to a single male Y chromosome which has had only seventy-five thousand (or so) years to “drift” – the mathematics of drift in DNA only gets us back that far. All homo sapiens mitochondrial DNA (always inherited from the mother) has been drifting for roughly three times that long.

The single geographical area with the greatest diversity of homo sapiens DNA is Africa, This argues strenuously that, since drift has gone on longer there than anywhere else, that’s where we started.

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