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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 IA. IB and i
(a) How many different genotypes are Likely to be present in human population?
(b) Also, how many phenotypes are possibly present?

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(a) Six genotypes are likely to be present in human population: IAIA, IAI IBIB, IB i, IAIB, ii
(b) Four phenotypes are possible. A, B, AB and O
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