Are you researching genetics however don’t know the codominance vs. Incomplete dominance differences? What’s the difference in between incomplete dominance and also codominance? Why is it important to know?

In this guide, we describe what incomplete dominance and codominance are, and how they’re different, making use of real-world examples to make these state clear and also easy come understand.

You are watching: Compare and contrast codominance and incomplete dominance

What Is Incomplete Dominance? What Is Codominance?

What is the difference in between codominance and also incomplete dominance? before we get into comparing them, let’s very first explain what incomplete dominance and codominance are. They space both important terms to recognize when studying genetics and inheritance patterns.

Incomplete dominance and also codominance space both species of inheritance whereby one allele (a form of a gene) isn’t fully dominant end the other allele. This results in a new phenotype (the physical characteristics of one individual).

Incomplete Dominance


Incomplete supremacy is when there is a mix of the two alleles that outcomes in a third phenotype that doesn’t look like either that the parents. The standard example is once a white flower and red flower space crossed. V incomplete dominance, all their offspring would certainly be solid pink flowers, a completely new phenotype. Girlfriend don’t view either of the parental phenotypes (i.e. White or red) in the offspring.

Two common examples the incomplete supremacy are height and hair color. Offspring will most likely not have actually the specific same elevation or hair color as one of their parents yet will regularly have a blend in between the two parent’s phenotypes.



In codominance, both alleles space expressed together in the offspring. If we cross a red flower and white flower that have actually a codominance inheritance pattern, the offspring would be flowers v red and also white spot on them. Unlike incomplete dominance, wherein the 2 parent phenotypes are blended together right into a brand-new phenotype, in codominance, both parental phenotypes display up together on the offspring.

The most usual example the codominance is the abdominal muscle blood type. If a human with A form blood and a human with B form blood have a child, the child can have type AB blood whereby both phenotypes are completely expressed.

Examples of Incomplete Dominance and Codominance

When to compare codominance vs. Incomplete dominance, it can be helpful to see visuals of how they happen their gene onto your offspring. Below are three Punnett squares, two for incomplete dominance and one because that codominance.

Incomplete Dominance

In the Punnett square below we room crossing a pure red flower (RR) v a pure white flower (rr). Under incomplete dominance, all of their offspring would be pink (Rr).

Under the complete dominance type of inheritance (the type of inheritance girlfriend probably very first studied when learning about genetics), all the offspring would be red flowers, due to the fact that the red allele would certainly be fully dominant end the white allele. However, as stated above, with incomplete dominance, the two parent phenotypes are mixed together in the offspring.


What happens as soon as you cross two pink (Rr) flowers? half the offspring would be pink (Rr), a quarter would certainly be red (RR), and a quarter would certainly be white (rr) as you can see in the Punnett square below.


When the 2 alleles space the same, one of two people RR or rr, incomplete dominance doesn’t matter due to the fact that there is no mix of various alleles. that only as soon as an individual has actually two different alleles (like Rr) that incomplete supremacy comes into play.



For our codominance example, let’s say we’re crossing cows that have actually codominance inheritance rules for your coat color. Cows with the genotype BB are fully black, those through the genotype WW are totally white, and when they room crossed, cows with the genotype BW have black and also white spots throughout their body. (When doing a overcome that follows codominance inheritance patterns, all funding letters room usually supplied to stand for the alleles to show no allele is leading over the other.)

By now, you can probably tell the if you to be to overcome a pure black cow with a pure white one, every the offspring would have black and also white spots because they’d all have actually the BW genotype.

Below is a Punnett square showing what happens once you overcome a pure black cow (BB) through a black and white spotted cow (BW).


From the Punnett square, you can see that fifty percent of the offspring will be pure black, and also the other fifty percent will have black and also white spots.

Summary: What Is the Difference between Incomplete Dominance and also Codominance?

Incomplete dominance and codominance room two types of genetic inheritance, and also while both are variants on the typical dominant/recessive traits, it’s necessary to know the difference between incomplete dominance and codominance.

Incomplete prominence is as soon as the phenotypes the the two parents blend with each other to create a new phenotype for your offspring. an example is a white flower and also a red flower producing pink flowers. Codominance is when the 2 parent phenotypes room expressed together in the offspring. an instance is a white flower and a red flower developing offspring with red and white patches.

Being may be to explain the difference in between incomplete dominance and also codominance will aid you understand different inheritance patterns and also be able come answer genes questions (especially = incomplete prominence vs. Codominance questions) much more easily.

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