codominant
the expression of both of two different alleles in a heterozygote
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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Definition of codominant :
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Codominant alleles
Codominant alleles occur when rather than expressing an intermediate phenotype, the heterozygotes express both homozygous phenotypes.
Codominant Used to describe alleles which can both be recognised in the phenotype of a compound heterozygote.
D. codominant, complimentary
E. dominant, recessive
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Thursday, October 1, 1998
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An example of a codominant trait occurs in certain types of calves (cow's young). Some calves are known as "blue roans" for their appearance of both blue and grey hairs.
A and B are codominant. Both alleles make antigens when present in the same individual. A and B are both dominant to O. If a person's phenotype is type AB, you know their genotype is AB. If a person is type O, you know their genotype is OO.
An isoenzyme whose synthesis is controlled by codominant alleles of one gene.
Related Terms:
Isoenzyme (isozyme)
Multiple forms of an enzyme whose synthesis is controlled by more than one gene. See also alloenzyme.
Only 2 alleles can be present in a diploid cell → IAIB is codominant, I0 recessive
Codominance (1:2:1)
Heterozygous allele is neither dominant nor recessive → both alleles are expressed ...
restriction fragment length polymorphism (RFLP) A heritable difference in DNA fragment length and fragment number; passed from generation to generation in a codominant way.
The carbohydrate chain is attached to a membrane protein or lipid. Blood type B cells have have a different carbohydrate chain. Type AB cells have both A and B chains. IA and IB are codominant because both phenotypes are expressed; ...
 See also: Dominant, Alleles, Allele, Homozygous, Gene
  
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