Research indicates that genetic differences in Neanderthal blood proteins may have played a role in their extinction. Scientists discovered that Neanderthals had a rare RhD blood type, which was incompatible with the blood types of Denisovans and Homo sapiens. This incompatibility could have led to hemolytic disease in mixed-species offspring, resulting in severe heal…Research indicates that genetic differences in Neanderthal blood proteins may have played a role in their extinction. Scientists discovered that Neanderthals had a rare RhD blood type, which was incompatible with the blood types of Denisovans and Homo sapiens. This incompatibility could have led to hemolytic disease in mixed-species offspring, resulting in severe heal…