Multiple choice

What conclusion is made while analysing the phenotypes of the ABO blood system?

  1. O is dominant over A.

  2. B is dominant over A.

  3. O is recessive to all other alleles.

  4. A is dominant over B.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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