Q.ABO blood group in man is controlled by :

Multiple alleles describes a gene that has three or more alternative allelic forms present across a population, even though the gene still occupies a single chromosomal locus and any one diploid individual can carry only two of those forms at once. The standard example is the human ABO blood group gene (the I gene), which has three alleles - IA, IB and i - whose different pairwise combinations produce the four blood types: IAIA or IAi gives type A, IBIB or IBi gives type B, IAIB gives type AB, and ii gives type O. The IA and IB alleles are codominant with each other (both are expressed together in an IAIB individual), while both IA and IB are separatel …