Multiple choice

Few individuals are AB blood types of the ABO blood system. They posses all the features of both type A and type B blood but they are not a blend of them. This is due to the

  1. codominance

  2. dominance

  3. blending

  4. pleiotropy
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A Correct answer
Explanation

Codominant traits are the ones in which both alleles are expressed when the phenotype is heterozygous. In the case of the ABO blood type system, A and B are codominant. They are also completely dominant over O.

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