The number of phenotypes in ABO blood group i | vedclass

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(B) The $ABO$ blood group system in humans is controlled by the gene $I$. The gene $I$ has three alleles: $I^A, I^B,$ and $i$.Since there are three al

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$4$

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(B) The $ABO$ blood group system in humans is controlled by the gene $I$. The gene $I$ has three alleles: $I^A, I^B,$ and $i$.Since there are three alleles,the possible genotypes are $I^A I^A, I^A i, I^B I^B, I^B i, I^A I^B,$ and $ii$,totaling $6$ genotypes.However,the phenotypes are determined by the expression of these alleles. $I^A$ and $I^B$ are dominant over $i$,and $I^A$ and $I^B$ show codominance.The resulting phenotypes are:$1$. Type $A$ (from $I^A I^A$ or $I^A i$)$2$. Type $B$ (from $I^B I^B$ or $I^B i$)$3$. Type $AB$ (from $I^A I^B$)$4$. Type $O$ (from $ii$)Thus,there are $4$ distinct phenotypes.

The number of phenotypes in $ABO$ blood group is

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