ABO blood groups in human beings are controlled by the gene I. The gene I have three alleles I^A, I^B and i. How many phenotypes can occur?

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Detailed Solution

The ABO blood group system in humans is controlled by the I gene, which has three alleles: I^A, I^B, and i. These alleles determine the presence of specific antigens on the surface of red blood cells. The combinations of these alleles can result in different blood group phenotypes.

There are four possible blood types (phenotypes) based on the presence or absence of the A and B antigens:

Blood Type A (I^AI^A or I^Ai) - This blood type has antigen A on the red blood cells.
Blood Type B (I^BI^B or I^Bi) - This blood type has antigen B on the red blood cells.
Blood Type AB (I^AI^B) - This blood type has both antigens A and B on the red blood cells.
Blood Type O (ii) - This blood type lacks both antigens A and B on the red blood cells.
So, there are four different blood group phenotypes that can occur in the ABO blood group system based on the combinations of the I^A, I^B, and i alleles.