AB blood type is an example of codominance. It is a type of dominance where alleles of a pair are fully expressed. This would result to a product that is neither recessive not dominant and an AB blood type is a perfect example.
Codominance is a phenomena in which both the alleles of gene are expressed in an individual, playing a dominant role in the expression of a triat. In AB blood grouping A and B both allele are dominent thus they can equally exert their impact for the expression of trait.
