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Which populations have especially high frequencies of blood type A?

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Close-up illustration of multiple human red blood cells with their characteristic disc shape, floating against a red background. — blood group The major component of human blood is the red blood cell.

The frequency of the A gene varies across human populations due to factors such as genetic drift and natural selection.

According to research on blood groups, the frequency of the A gene is highest among the following populations:

Australian Aborigines1
The Blackfoot Indians of Montana in the United States1
The Sami people of northern Scandinavia1

While these groups exhibit particularly high frequencies, blood group distribution is a global phenomenon influenced by evolutionary history and the inheritance of specific genes from parents.12