How is incomplete dominance and co-dominance different from a normal Mendelian cross?

The correct answer is: The heterozygous genotype has a distinct phenotype.

• In incomplete dominance, there is a phenotypic blending i.e the heterozygous phenotype is an average of the phenotypes of the two alleles. Example- flower colour of Mirabilis Jalapa.
• In co-dominance both the alleles completely express themselves without any blending of characters. Example- ABO blood grouping system

incomplete dominance, only one allele in the genotype is seen in the phenotype.
In co-dominance, both alleles in the genotype are seen in the phenotype.