ABO blood grouping is controlled by gene I which has three alleles and show codominance. There are six genotypes. How many phenotypes are possible?

Six

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Three

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Four

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Five

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Solution

The correct option is D Four
There are four main blood groups A, B, AB and O. ABO blood group system is the classification of human blood based on the inherited properties of red blood cells due to the presence or absence of the antigens A and B, which are carried on the surface of the red cells. Thus the correct answer is option C.

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