Codominance

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Related to codominant: codominant inheritance

codominance

[kō′däm·ə·nəns]

(genetics)

A condition in which each allele of a heterozygous pair expresses itself fully, as in human blood group AB individuals.

Codominance

expression in heterozygotes of characters typical of both forms (alleles) of the gene.

Codominance is found, for example, in studying blood serum proteins (transferrins). In individuals heterozygous for the alleles controlling the biosynthesis of transferrin, both forms of this protein are present in the blood at the same time, and each form is found separately in the corresponding homozygote. The same patterns of heredity are also found in other proteins, including almost all the enzymes. The degree of activity of each of the allelic genes may be different. The products synthesized under the control of two alleles of the same gene may independently influence the expression of a character or they may interact with each other. The existence of codominance is useful in studying the genetic structure of populations without making crossings or studying pedigrees; instead, modern biochemical and immunological methods of separating proteins are used. Codominance in erythrocytic antigens facilitates the identification of blood groups in man and animals.

V. S. KIRPICHNIKOV

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References in periodicals archive ?

Codominant stems can be fairly well secured to a tree provided there is no included bark in the crotch (Figure 3-5).

Chapter 3 Tree structure

For codominant markers, coefficients that quantify genetic variance among individuals inside each locus (KOSMAN; LEONARD, 2005; PEAKALL et al.

Comparison of multiallelic distances for the quantification of genetic diversity in the papaya/Comparacao de distancias multi-alelicas sobre a quantificacao da diversidade genetica em mamao

6 m from five dominant or codominant trees from a 57-year-old red pine plantation.

Microfibril angle variation in red pine (Pinus resinosa Ait.) and its relation to the strength and stiffness of early juvenile wood

Most recently, Mokady and Buss (1996), based on a series of incrosses and backcrosses derived from a single mated pair (one member of which was highly inbred) argued that, as in the ascidian genus Botryllus, a single, highly polymorphic locus with multiple codominant alleles controls allorecognition in H.

Evolutionary genetics of allorecognition in the colonial hydroid Hydractinia symbiolongicarpus

To optimize the framework maps, more microsatellite markers or other kinds of codominant markers (e.

Genetic linkage maps of the noble scallop Chlamys nobilis reeve based on AFLP and microsatellite markers

Because of the codominant nature of many SSRs, absence of an allele is an indication of similarity among genotypes.

Molecular marker diversity and field performance in commercial cotton cultivars evaluated in the southwestern USA

Extremely low plasma concentrations of LDL-cholesterol and apoB (below the 5th percentile for age and sex) are characteristic of FHBL, a codominant disorder that can be caused by mutations in the APOB gene (2, 3).

Liver dysfunction and steatosis in familial hypobetalipoproteinemia

The DBH of most of the dominant and codominant trees in each stand ranged from approximately 12 to 15 inches.

Longitudinal shrinkage, kiln-drying defects, and lumber grade recovery of red pine (Pinus resinosa Ait.) from a 125-year-old natural stand and a 57-year-old plantation. (Solid Wood Products)

Without such pruning, codominant stems will form on many trees (Figure 8-3).

Chapter 8: Nursery shade tree production pruning: developing the trunk and leader

McCormick and Platt (1980) examined sites in the southern Appalachians that had previously been studied in 1939 and found that hickory had replaced American chestnut as a codominant species with oak.

Species composition in a central hardwood forest in Kentucky 11 years after clear-cutting

98, codominant modifiers with increasing selfing rates from 0 to 0.

Fixation probabilities of selfing rate modifiers in simulations with several deleterious alleles with linkage

Microsatellite loci are commonly used to explore the genetics of closely related species and would be of great value in the study of mussels because of their rapid evolution, codominant Mendelian inheritance, high polymorphism, and presumed neutrality.