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  4. Choose the correct option with respect to the genetic makeup of the ABO blood grouping system in humans.

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Q. Choose the correct option with respect to the genetic makeup of the ABO blood grouping system in humans.

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Solution:

ABO blood group system is example of multiple allelism in which 3 alleles are there to control the blood group. These 3 alleles are A (Dominant), $B$ (Dominant) and O (Recessive). This blood grouping has 4 types of phenotypes (as 4 blood groups) which are $A, \, B, \, O$ and $AB$ . This grouping has total 6 types of genotypes which are $AA, \, AO, \, BB, \, BO, \, AB$ and $OO$ .