The absence of the A and B alleles in Native American populations is a result of:

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The founder effect is the reduction in genetic variation that occurs when a small subset of a larger population establishes a new colony. This subset may not have the full range of alleles present in the larger population, which can lead to certain alleles being overrepresented or completely absent in the new population. The absence of the A and B alleles in Native American populations is thought to be a result of the founder effect, as the ancestors of modern Native Americans migrated across the Bering Strait and formed new populations in the Americas. Over time, the A and B alleles may have been lost due to chance events in the founding populations, rather than through natural selection, gene flow, or mutation.

The Absence of the a and B Alleles in Native