Blood type is an example of codominance, in which two alleles may be expressed, but neither one may be dominant over the other.
In the field of genetics, codominance can be described as a phenomenon in which the different types of alleles for a particular gene are both expressed in an organism. There is no recessive allele in such a case as both alleles express themselves.
An example of codominance is the ABO blood group system. All the alleles A, B and O express themselves separately and none of them is recessive to the other. Both the alleles for these genes express themselves in an individual and determine the blood type of an individual.
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