Compare and contrast codominance with incomplete dominance.
Answers
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In both codominance and incomplete dominance, both alleles for a trait are dominant. In codominance a heterozygous individual expresses both simultaneously without any blending. An example of codominance is the roan cow which has both red hairs and white hairs.
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)