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The allele 14 encodes a transferase enzyme which catalyzes the reaction of converting the H-antigen into the A-antigen with t

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Answer will be 3 rd option codominance which means if both present then it get expressed while any one absence there is no expression.

As H and I​​​​​​A should be present then A type blood group formed if either of these allele absent H or I​​​​​​A  then O type blood grouping

Hope it's clear .thanks

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