User blog comment:Dragonzzilla/Describe Your Mass Effect 3 Ending/@comment-3076194-20120903223529/@comment-5267262-20120903232107

Nah the DNA is never mentioned as being an issue, its the amino acids (component of protein) that is different. I do not know quite how different the DNA between a horse and a donkey is (although I do know they have different numbers of chromasones or however you spell it), but still cross breeding produces a live but infertile young.