Genetic basis for co-dominance
Parental phenotypes : blood group M * blood group n
Parental genotypes : mm * nn
Gametes produced by parents : m n
Genotype of F1 generation : MN
Phenotype of F1 generation : All of blood group MN
Both co-dominance and incomplete dominace demonstrate three variations for the trait. Unlike co-dominance results in a phenotype that is in between that of the homozygous conditions.