BSG science: In which we find out of G-G-G-G-ma was a Neanderthal

Ever wonder why colonials and Cylons can interbreed? Well it turns out there's a blog devoted to the science of Battle Star Galactica. (Correct response: "Well I'll be hogswallered!") Tho I'm not sure I'd use Neanderthals and H. sapiens as my corollary. Perhaps pig and elephant?