Multiple choice

The ABO blood group system in humans is controlled by

  1. IA and IB dominant, and IO recessive alleles

  2. IA dominant and IO and IB recessive alleles

  3. IA, IB and IO dominant alleles

  4. IA, IB and IO recessive alleles

  5. None of these
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A Correct answer
Explanation

This is the correct option. The ABO blood group system in humans is controlled by two dominant and one recessive alleles.

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