Is it coincidence that the top ten fastest sprint times over 100m are held by black men, or is there a known genetic advantage that can be proved?

This is something I happened to notice and led me to question whether, provided it can be proved that there is some kind of genetic advantage, would it be acceptable to have different event groupings for white/black athletes for particular sports, just as we have separate mens and womens events? I realise this subject can be controversial but would there be anything wrong with this? As it stands and based on results to date it would appear that white athletes are at some form of disadvantage. Is this true, or purely coincidence?