ABO blood grouping is controlled by gene I which has three alleles and shows co-dominance. There are six genotypes. How many phenotypes in all are possible?
three
four
five
six
, the gene I responsible for ABO blood grouping has three alleles: , , and . While there are six possible genotypes formed by the combination of these alleles, they result in only four distinct phenotypes: Blood groups A, B, AB, and O .
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