Difference Between Codominance and Incomplete Dominance l Codominance vs Incomplete Dominance

The key difference between codominance and incomplete dominance is based on the expression of the traits in the offspring. In Codominance, the offspring receive a combination of both parent genes, whereas, in Incomplete dominance, neither one of the parent genes expresses.

In genetics, Gregor Mendel discovered the Principal of Dominance. But, it was found that the inheritance of traits takes place due to other non-Mendelian patterns as well. Codominance and Incomplete Dominance are two phenomena that deviate from Mendelian Genetics. Codominance is the phenomenon where the offspring receives both the parent genes as a combination of both the genes. Thus, both the genes express equally in the offspring. In contrast, incomplete dominance is the phenomenon where neither one of the parent genes expresses, instead expresses phenotype, which has a combined effect of both genes.


1. Overview and Key Difference
2. What is Codominance
3. What is Incomplete Dominance
4. Similarities Between Codominance and Incomplete Dominance
5. Side by Side Comparison – Codominance vs Incomplete Dominance in Tabular Form
6. Summary

What is Codominance?

Codominance is a non-Mendelian inheritance pattern. In this phenomenon, the offspring shares a codominant relationship with the parent-progeny. In Codominance, the offspring receives both parent genes in equal proportions. Both the dominant and the recessive alleles are equally expressed in the offspring. Thus, the alleles simultaneously express in codominance. In codominance, independent expression of alleles occurs, hence, there is no mixing of alleles during the codominance. Furthermore, there is also no quantitative effect on Codominance.