With respect to the ABO group, there are four major blood

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With respect to the ABO group, there are four major blood types because this blood group is determined by

1. three alleles, all of which are recessive
2. three alleles, of which, two are recessive and the third is dominant
3. three alleles, of which two are codominant and the third is recessive
4. three alleles, all of which are codominant

Correct Option: C

Blood group is determined by three alleles - I^A, I^B, and I^o. Alleles I^A and I^B are codominant. Blood group A is determined by I^A I^A or I^A I^o. Blood group B is I^B I^B or I^B I^o. Blood group O is I^o I^o. Blood group AB is I^A I^B.