Human blood group is a good example of multiple allelism and co–d…

Question

Human blood group is a good example of multiple allelism and co–dominance. Justify.

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Answer

Multiple allelism: Generally in an individual or population, only two alleles of a trait govern the character, but in case of ABO blood group, three alleles $I^A, I^B$ and $i$ are found to govern blood group in human population. This is multiple allelism.
Co-dominance: Allele $I^A$ and $I^B$ when present in an individual, both being dominant express their own types of sugars or traits. Thus, exhibiting co-dominance.

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