Question

Sol.(a) [Key Concept: ABO Blood Groups — I^A i Genotype] If one parent contributes I^A allele and the other contributes i allele, the offspring's genotype is I^A i. The I^A allele is DOMINANT over i (recessive). I^A i genotype → blood group A phenotype (expresses only A antigens on red blood cells, since I^A masks i). Blood group O would require ii genotype (both alleles recessive); AB would require I^A I^B genotype.