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The gene I that controls the ABO blood g...

The gene I that controls the ABO blood grouping in human beings has three alleles `I^A , I^B` and i:
(a) How many different genotypes are likely to be present in the human population? (b) Also, how many phenotypes are possibly present?

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(a) `I^A I^A , I^A i , I^B i , I^A I^B` ii (b) A, B, AB , O
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