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

(A) six 

(B) Three

(C) Four

(D) Five

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Correct Option- (C) Four 

Explanation - 

The six genotypes are -IA IA or IAi, IB I B or IB i, I AI B , ii. 

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