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in Biology by (71.3k points)

Blood grouping in humans is controlled by 

(A) 4 alleles in which IA is dominant 

(B) 3 alleles in which IA and IB are dominant 

(C) 2 alleles in which none is dominant 

(D) 3 alleles in which IA is recessive

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(B) 3 alleles in which IA and IB are dominant

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