(January 4, 2012 at 1:25 am)TheDarkestOfAngels Wrote: Interbreeding does muddy the waters a bit. Us white folks have a significant portion of our DNA is Neaderthall, after all. There's no telling how much more mixing interbred DNA has made it this far.
It just goes to show that we'll screw around with it if the parts fit well enough.
Indeed, it is possible for different, but some closely related sexual species to interbreed in a limited way and produce fertile offspring, thus carry genes from one species to another.
The issue of whether two similar sexual population belongs to the same species thus can not in all cases be ascertained with a single acid test of fertility in offspring.
