One hundred percent of Peruvian Indians tested have blood type O. How can this type be so prevalent if it is based on the presence of two recessive alleles (ii)?

Due to the presence of dominant allele.

Explanation:

This type of blood is prevalent even if two recessive alleles are present because the allele of blood type O is dominant as compared to other two recessive allele. Due to dominance of the blood type O, the blood type of next generation will also be type O. we know that only the dominant allele will appear in the offspring so that's why the Peruvian Indians have blood type O.

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