Multiple choice

In predetermining the phenotype for the ABO blood system

  1. blood group O is dominant at blood group A

  2. blood group B is dominant at blood group A

  3. blood type O is recessive

  4. blood type AB is recessive
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The rules of dominance for the ABO system is that both A and B are dominant over O (i.e. O is recessive) and A and B are codominant.

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