(C) The human $ABO$ blood group system is controlled by the gene $I$. The gene $I$ has three alleles: $I^A$,$I^B$,and $i$ (or $I^O$).For blood group $

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(C) The human $ABO$ blood group system is controlled by the gene $I$. The gene $I$ has three alleles: $I^A$,$I^B$,and $i$ (or $I^O$).For blood group $A$,the individual can be homozygous $(I^A I^A)$ or heterozygous ($I^A i$ or $I^A I^O$).Therefore,the possible genotypes for blood group $A$ are $I^A I^A$ or $I^A I^O$.