What blood type are most Native Americans?
Anthropological and genetic studies examining indigenous populations across the Americas reveal a remarkable historical uniformity regarding blood group genetics. The overwhelming majority of Indigenous peoples of the Americas possessed Blood Type O prior to European contact, with many native tribal communities exhibiting near 100% frequency of the O blood group allele. While centuries of intermarriage and genetic mixing with immigrant populations have introduced other blood types into modern tribal communities, Type O remains heavily predominant across Native American populations.
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