Question
With respect to the $$ABO$$ group, there are four major blood types because this blood group is determined by
A.
three alleles, all of which are recessive
B.
three alleles, of which, two are recessive and the third is dominant
C.
three alleles, of which two are co-dominant and the third is recessive
D.
three alleles, all of which are co-dominant
Answer :
three alleles, of which two are co-dominant and the third is recessive