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Question

Is ABO blood grouping co-dominance?


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Solution

ABO blood group:

  1. Yes, the ABO blood group is an example of codominant genetic expression.
  2. ABO blood group is the result of codominant expression of the A, B, and O alleles on the blood cells.
  3. The genotype IAIB has alleles IA and IB that are codominant and equally expressed in the phenotype.
  4. Whereas the O allele is recessive as it codes for an enzyme without any function.
  5. People with the AB blood group have the A antigen and B antigen (polysaccharide) on the cell surface of their RBCs.

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