a. The blood groups in humans are controlled by the gene I which exist in three allelic forms ‘i’, ‘IA’, and ‘IB’. Thus, it shows multiple allelism i.e., a phenomenon where a gene exists in more than two allelic forms.
IA, and IB codes for glycoprotein that protrudes from the surface of the RBCs while ‘i’ does not code for anything. Therefore IA, and IB are codominant over each other i.e., two alleles of a gene are not dominant over each other and express themselves independent of each other.
i. The phenotype of IAi is A blood group
ii. The phenotype of ii is O blood group
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