How many genotypes and phenotypes are possible in the ABO blood group system?
Correct answer C. 6 genotypes and 4 phenotypes
Explanation
Genotypes: IᴬIᴬ, Iᴬi, IᴮIᴮ, Iᴮi, IᴬIᴮ and ii (6); phenotypes: A, B, AB and O (4). Groups A and B each have two genotypes, homozygous and heterozygous.
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