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Codominant


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 occur when rather than expressing an intermediate phenotype, the heterozygotes express both homozygous phenotypes. An example is in human ABO blood types, the heterozygote AB type manufactures antibodies to both A and B types.
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AFLP's, can be codominant markers, like RFLP's. Codominance results when the polymorphism is due to sequences within the amplified region.
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An example of this would be seen if, when crossing flowers with codominant "blue" and "purple" alleles for petal color, the resulting offspring would have violet petals.
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A gene containing the codominant pure blood type alles "AA" and "BB" would result in a blood type of "AB". A third exception is "blending inheritance", present in flower blossoms as well.
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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.
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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; ...
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