…but wolves and dogs are the same species. They can interbreed without reproductive defects. I'm not a biologist or even in STEM at all, though, so disclaimer for that.
Half Indigenous Australian people exist, anon, whether you like it or not.
As for my opinion on the thread's topic, I do believe there are racial differences but they are not absolute and aren't as important as culture (in regards to shaping an individual's personality). Therefore there should be no rules/laws forbidding people of certain races from doing what they like. So long as they can do something well (a job, a sport, etc.), let them.
Making character assumptions about people based on their race is also stupid, although I'm biased in this regard since I'm an Amerindian and don't live up to any of the social stereotypes (don't drink or drug, not promiscuous, never committed crime). I wouldn't say I'm a special case, either. Living life expecting every black person to be a criminal, every Jew to be greedy, etc. is a ridiculous way to live. Just my two cents.