Difference Between Incomplete Dominance and Codominance

Codominance and Incomplete dominance are two types of genetic inheritance. Codominance essentially means that no allele can block or mask the expression of the other allele. On the other hand, incomplete dominance is a condition in which a dominant allele does not completely mask the effects of a recessive allele. Read on to explore more differences between the two.

Difference Between Codominance and Incomplete dominance

Codominance

Incomplete Dominance

Meaning

2 parent phenotypes are expressed together in their offspring

2 parents blend together to create a new phenotype for their offspring

Dominance

The two alleles neither act as dominant or recessive over the other

One allele is not completely dominant over the other

Effect

Both the alleles blend equally and show the traits in their offspring

Both alleles blend, however only one of the two is noticeable in the offspring

Other Characteristics

A hybrid will not result in the formation of a new phenotype

A hybrid will always result in a new phenotype

Example

Individuals with blood group ABO exhibit Codominance. A and B are dominant in relation to O, however, they are not dominant against each other.

Snapdragon, Antirrhinum majus (pink flowers are resultant when crossed between a homozygous red flower and a homozygous white flower)

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Frequently Asked Questions on Incomplete Dominance and Codominance

What is the difference between incomplete dominance and codominance?

Codominance signifies that no allele can block or mask the expression of the other allele. Incomplete dominance signifies the condition in which a dominant allele does not completely mask the effects of a recessive allele.

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