sfs
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That's the case if the two species have a fixed difference at a site, which is also a practical application of common descent. The application I'm talking about, however, is for variants within our species, and for that we need only one other species to make the comparison (although two is better).If you only have two species, you still can't figure out the ancestral sequence. You need a third, more distantly related species, preferably a few species. If a base is conserved by even more distantly related species, then it tells you which genome has the mutation. Using evolution, we have those evolutionary relationships and can figure this stuff out which has practical uses for figuring out the causes of diseases or possible routes of resistance.
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