What is observed in the phenotype under codominance?

In codominance, both alleles in a heterozygous organism are fully expressed, resulting in a phenotype that distinctly shows both traits without blending. This means that when an individual has two different alleles for a trait, neither allele is recessive, and both contribute to the phenotype in a way that is clearly observable.

For example, in certain flower species, if one allele produces red petals and another produces white petals, a plant displaying codominance would have flowers with both red and white patches or stripes, rather than a single blended color. This is in contrast to complete dominance, where one allele would overshadow the other, resulting in a phenotype that reflects only the dominant trait. Similarly, incomplete dominance would present a blend of the traits instead of both being shown distinctly.