Under certain conditions, these haplogoups can change radically very quickly inside the same "ethnic" group, leaving only minimal signs of change in the initial autosomal baggage.
I have exposed here:
https://www.eupedia.com/forum/threa...ps-frequencies?p=551805&viewfull=1#post551805
And that probably can explain many things. Like diferent groups which looks close autosomaly but having diferent Y-haplogroups.
I believe in what I have said before. Y haplogrups can decrease and grow very quickly because they are transmitted only paternally.
Thus, a proportion of only 1% (newly appeared Y haplogroup) in a given population can pass 50% in only 300 years, without this meaning a mass migration of the population to replace the 99% native one. In 600 years, that new 1% Y haplogroup becomes dominant with 99% without replacing local population.
That could be the main cause and explain many dilemmas .... If it's true what I say then it has an extraordinary impact on present theories.
p.s. Knowledge, culture artifacts, can spread very quickly in different populations, almost the same as haplogroups, which does not mean that a population has replaced genetically other population.
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