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The answer is obvious: Neanderthal haplogroups did survive and are right under our noses but they are merely being written off as "contamination" when they are found in Neanderthal DNA (this happens routinely). TMCRA date$ for non-African Y-DNA backs this up:
http://blogs.plos.org/neuroanthropol...et-hypothesis/
The whole "only female hybrids reproduced" thing is utter bullshit.
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