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(B) $ABO$ blood grouping in humans is controlled by three alleles: $I^A, I^B,$ and $i$. Since there are more than two alleles involved,it is an exampl

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$I$ and $II$ are correct

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(B) $ABO$ blood grouping in humans is controlled by three alleles: $I^A, I^B,$ and $i$. Since there are more than two alleles involved,it is an example of multiple allelism.Statement $I$ is correct.When both $I^A$ and $I^B$ are present together,they both express themselves equally,resulting in the $AB$ blood type. This phenomenon is known as codominance.Statement $II$ is correct.Codominance is phenotypically manifested in humans because individuals with the $AB$ blood type express both $A$ and $B$ antigens on the surface of their red blood cells,which can be detected through blood testing.Statement $III$ is correct.$ABO$ blood grouping does not follow Mendel's law of independent assortment in the context of multiple alleles,though it follows segregation. However,in the context of standard biology questions,statements $I, II,$ and $III$ are the most accurate descriptions of the system.

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