Example: Codominance
Species: Four o'clock plants
Trait: Flower color
Pure line phenotypes: Red or white flower
Parental cross: Red x White
F1: Expect red or white flowers. But, the F1 plants produced pink flowers. Next the F1 plants are selfed.
F2 phenotypic ratio:1/4 Red : 1/2 Pink : 1/4 White.0
When the F2 generation was selfed, it was determined that the red and white flowered were homozygous, and the pink flowered plants were heterozygous (they segregated with the same phenotypic ratio as the F2 plants. Thus, the presence of both alleles contriubuted to the phenotype of the heterozygous individuals.
