I tend to wonder just how much those genetic difference really matter since they're finding that we're all different from each other. Even siblings. The main thing we have in common is that we're human. Just as different breeds of dogs have defined genetic differences that cause them to look different, have different color coats, they're still all dogs. Anyone saying that one breed is "better" than another just sounds dumb, yet people still insist that it's okay when talking about humans.