This is a question which keeps coming up. And the reason it pops up again and again is that no answer given has ever been satisfactory enough to lead readers to conclude that “this is it”. First of all, we cannot say with certainty whether or not the Neanderthals were rh negative. An old article claiming that “Neanderthals were universal donors” was unsubstantiated. It is true that the 2 specimens examined in Spain were tested as being blood type O. The rh factor however has not been indicated. And it could have also been the case that these specimens were AO or BO with the A or B allele having deteriorated over time. Since the Neanderthals were very diverse, it … Continue reading Why did the Neanderthals go extinct?