Rh-Negative Blood Type Traits: Large Head, Low Blood Pressure--and Alien Ancestors? The majority of people in any region are Rh positive. Caucasians are the most likely to be Rh negative, with approximately 17% of blood donors demonstrating a lack of this protein and highest in Basques. Native Americans are the next highest proportion of the population to test as Rh negative: approximately 10% of donors from this population lack this protein.
Rh-Negative Blood Type Traits and Characteristics: Large Head, Low Blood Pressure--and Possible Alien Ancestors?