Codominance is shown by the gene controlling:

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(C) Codominance is a phenomenon where both alleles of a gene pair express themselves equally in the heterozygote. In humans,the $ABO$ blood group syst

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Blood group

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(C) Codominance is a phenomenon where both alleles of a gene pair express themselves equally in the heterozygote. In humans,the $ABO$ blood group system is controlled by the $I$ gene. The $I$ gene has three alleles: $I^A$,$I^B$,and $i$. When both $I^A$ and $I^B$ are present together in an individual,they both express their respective sugars,resulting in $AB$ blood type. This is a classic example of codominance.

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