Proving Evolution in the Age of Genetics

Just to poke my nose in here. This is actually inaccurate (at least as far as dogs go). Fertile hybrids of dogs and other species of canids are relatively common. Dog-wolf, dog-coyote, even dog-fox hybrids are known. The simplified explanation is that the divergence (speciation events) separating the various species were relatively (evolutionarily speaking) recent, and total genetic isolation has not been achieved. Often the F2 generation of these hybrids "breeds back" to the "wild type".NosyQ

I absolutely adore that phrase. I'd like to use it in an essay I'm working on. Did you invent it or is it something you remember reading somewhere? (I need to know for attribution issues.)

I know you understand, but I'm not sure your correspondent does, which is the only reason I added to/clarified what you wrote. You're totally correct that this is an example of the continuum of species. This was really Darwin's biggest contribution IMO: the break from typological to population thinking (essentialism vs evolution).