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Because when you look at mtdna frequency maps then most of the lame migration theories fall apart.
Well it's funny you never hear about migrations of mtDNA. The reason why is it points out the lie. Of course male dna moves around more but if you are talking about real migrations it ought to show some signs of that too, if big migrations are happening. But just like the ones you point to they all seem to center on a couple fixed locations and that's it.
It isn't just that "male dna moves around more," it's also that it has a higher extinction rate within stationary populations. That has a lot to do with powerful men being able to monopolize the gene pool in a way that women cannot. As a result, population bottlenecks and genetic drift may reduce a male lineage down to one recent representative in a given region, while preserving a dozen comparable female lineages. The result is a much fleshier tree for mtDNA than Y-DNA. Combine that with the fact that few studies have tested deep mtDNA clades, and that there is no such thing as mtDNA STRs, and it becomes too difficult to infer as much from the data. Even if female lineages moved around exactly as much as male lineages, this would be the case.
Little correction though. MtDNA it is an extra DNA contained in Mitochondria (mt) and not in cell nucleus together with 23 chromosomes. It never recombines with fathers DNA.I'm having a hard time finding where I read it, but I believe the X-chromosome from a father, and an X-Chromosome from a mother can recombine and mirror one another. In a female offspring with an X from dad and an X from mom would it be possible that the X from mom recombines with dad or mirrors dad to produce something that looks like a different mtDNA haplogroup than moms?
I've also read (somewhere, I'll try and find it) that mtDNA is not a good predictor for population movements because of it's fast mutation rate, and ability to recombine. yDNA is more stable, mutates slower and doesn't recombine, except in rare occasions like male XX syndrome.
I'm having a hard time finding where I read it, but I believe the X-chromosome from a father, and an X-Chromosome from a mother can recombine and mirror one another. In a female offspring with an X from dad and an X from mom would it be possible that the X from mom recombines with dad or mirrors dad to produce something that looks like a different mtDNA haplogroup than moms?
I've also read (somewhere, I'll try and find it) that mtDNA is not a good predictor for population movements because of it's fast mutation rate, and ability to recombine. yDNA is more stable, mutates slower and doesn't recombine, except in rare occasions like male XX syndrome.
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