What is the difference between codominance and epistasis?

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Solution

Codominance:
The phenomenon where a cross is done between individuals with two different phenotypes and the appearance of both parental phenotypes is seen together in the offspring is called codominance.
Epistasis:
The phenomenon where the expression of one gene affects the inheritance of one or more genes that are inherited independently is called epistasis.
Differences between co-dominance and epistasis:
Codominance
Epistasis
Two alleles are expressed to an equal degree within an organism.
One gene is modified by the expression of one or more other genes.
2. The traits associated with each allele are displayed simultaneously 2. It can have an important influence on several evolutionary phenomena.
3. Example: ABO blood group 3. Example: Red hair

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Column I	Column II
Pleiotropic gene	Both allele express equally
Codominance	Change in nucleotide
Epistasis	One gene shows multiple phenotypic expression
Mutation	Non - allelic gene inheritance

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Codominance	Epistasis
Two alleles are expressed to an equal degree within an organism.	One gene is modified by the expression of one or more other genes.
2. The traits associated with each allele are displayed simultaneously	2. It can have an important influence on several evolutionary phenomena.
3. Example: ABO blood group	3. Example: Red hair