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What's the difference between genome-wide data and mitochondrial genomes?
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[QUOTE]Originally posted by capra: [QB] They're quite different things, you can't really put a percentage on it. A mitochondrial chromosome is actually a kidnapped bacterial chromosome; it's structure is completely different and it is much much smaller than a nuclear chromosome. It has a small set of very important genes and very little 'junk', while your nuclear genome has a buttload of genes, some not all that important, and loads of 'junk DNA'. mtDNA tells about one line of ancestry, so what percentage of your ancestors that is depends on how many generations back you go. If you go far enough back you could have no autosomal material whatsoever from your mitochondrial DNA ancestor, and they'd be one out of thousands. Y DNA is a nuclear chromosome but similarly traces one line of ancestry. Thing is, they are very good at tracing that particular line of descent. Autosomal DNA represents all your ancestry (on average anyway), but it's scrambled together and much harder to make a neat tree of relationships with it like you can with uniparental markers. In short there isn't any straightforward percentage you can put on it, just autosomal is much more informative overall if you can get it. [/QB][/QUOTE]
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