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(C) The $ABO$ blood group system in humans is an example of multiple allelism. There are three alleles: $I^A, I^B,$ and $i$. - $I^A$ and $I^B$ are cod

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(C) The $ABO$ blood group system in humans is an example of multiple allelism. There are three alleles: $I^A, I^B,$ and $i$. - $I^A$ and $I^B$ are codominant,while $i$ is recessive to both. - The possible genotypes are: $I^A I^A, I^A i$ (Phenotype: $A$),$I^B I^B, I^B i$ (Phenotype: $B$),$I^A I^B$ (Phenotype: $AB$),and $ii$ (Phenotype: $O$). - Thus,the possible phenotypes are $A, B, AB,$ and $O$,which totals to $4$ distinct phenotypes.

$ABO$ blood grouping in humans is controlled by the gene $I$. It has three alleles: $I^A, I^B,$ and $i$. Due to these three different alleles,six different genotypes are possible. How many phenotypes can be formed from these?

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