How are blood groups in humans controlled?

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(B) In humans,$ABO$ blood grouping is controlled by the gene $I$. The gene $I$ has three alleles: $I^A$,$I^B$,and $i$.$I^A$ and $I^B$ produce slightly

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By $3$ alleles where $I^A$ and $I^B$ are dominant

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(B) In humans,$ABO$ blood grouping is controlled by the gene $I$. The gene $I$ has three alleles: $I^A$,$I^B$,and $i$.$I^A$ and $I^B$ produce slightly different forms of sugar,while allele $i$ does not produce any sugar.Alleles $I^A$ and $I^B$ are completely dominant over $i$,meaning when $I^A$ and $i$ are present,only $I^A$ expresses. However,when $I^A$ and $I^B$ are present together,they both express themselves due to codominance.Thus,blood groups are controlled by $3$ alleles where $I^A$ and $I^B$ show codominance and are dominant over $i$.

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