Pediatrics Genetics And Genetic Disorders 4dd4a5e1 ABO blood group is an example of? A Co-dominance B AD C AR D Mitochondrial inheritance High-Yield Explanation a. Co-dominance(Ref: Nelson's 20/e p, Ghai 8/e p 641)Codominance--When both alleles of a gene pair are fully expressed in a heterozygote, e.g. blood group antigens.