How valid is it to even talk about speciation within unicellular asexual populations and compare it to that seen in multicellular sexually reproducing populations, the criteria are obviously not the same there can be no reproductive isolation in the asexual organism, I am ignoring lateral transfer as that just makes things even
more complicated.
Speciation in the unicellular asexuals can simply be a heritable gain or loss of some specific structural or genetic feature,the proto-mitochondrion for example, and is distinct from the speciation seen in sexually reproducing multicellular organisms.
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