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Combines parental ABO genotypes allele by allele, treating A and B as codominant and O as recessive.
ABO inheritance
A and B are codominant and O is recessive, so AO expresses group A and only OO expresses group O
Yes, if both are AO heterozygotes, giving a one in four chance.
Rare hh individuals type as O regardless of their ABO genotype, which is why serology can surprise.