Explain the difference between incomplete dominance and codominance? Skip to main content

Explain the difference between incomplete dominance and codominance?

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Question: Explain the difference between incomplete dominance and codominance?

Incomplete dominance is a type of inheritance in which one allele does not completely dominate the other allele. This results in a phenotype that is a blend of the two parental phenotypes. For example, if one parent has red flowers and the other parent has white flowers, the offspring may have pink flowers.

Codominance is a type of inheritance in which both alleles are expressed equally in the offspring. This results in a phenotype that shows both parental traits. For example, if one parent has black feathers and the other parent has white feathers, the offspring may have spotted feathers.

Here is a table that summarizes the key differences between incomplete dominance and codominance:

CharacteristicIncomplete dominanceCodominance
Gene expressionOne allele is partially dominant over the other allele.Both alleles are expressed equally.
PhenotypeA blend of the two parental phenotypes.A combination of both parental phenotypes.
ExamplesPink flowers from a red flower and a white flower, roan horses from a chestnut horse and a black horseSpotted feathers from a black chicken and a white chicken, AB blood type from an A blood type parent and a B blood type parent

It is important to note that incomplete dominance and codominance are not mutually exclusive. In some cases, a gene may show incomplete dominance in one population and codominance in another population. This is because the dominance relationships between alleles can be influenced by environmental factors.

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