No, not necessarily. "Kind after kind" doesn't mean "white horse after white horse and grey horse after grey horse". It has been documented elsewhere that the many sorts of horses could be derrived by selective breeding of just those four carried upon the ark. Same could be said for humans. We don't know the race of Noah's daughter-in-laws, but one thing is for sure, the races of mankind has MORE DNA ALIKE than those which SEPERATE them. That being said, who can discount the possibility that ALL DNA traits are common across race and only a few differ in STRENGTH?