overdominance


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Related to overdominance: Multiple alleles

o·ver·dom·i·nance

(ō'vĕr-dom'i-năns),
That state in which the heterozygote has greater phenotype value and perhaps is more fit than the homozygous state for either of the alleles that it comprises. Compare: balanced polymorphism.

overdominance

(ō′vər-dŏm′ə-nəns)
n.
The condition of a heterozygote having a phenotype that is more pronounced or better adapted than that of either homozygote.
o′ver·dom′i·nant adj.

o·ver·dom·i·nance

(ō'vĕr-dom'i-năns)
That state in which the heterozygote has greater phenotype value and perhaps is more fit than the homozygous state for either of the alleles that it comprises.
Compare: balanced polymorphism

overdominance

a phenotypic condition in which the HETEROZYGOTE expresses a stronger manifestation of the trait than either HOMOZYGOTE. Overdominance produces heterozygous advantage that can maintain a GENETIC POLYMORPHISM in a population.
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References in periodicals archive ?
Being greater or lesser than 1 show the relative dominance and overdominance of genes.
Genetic study of agronomic traits in barley based diallel cross analysis
The high sea effects of the cross combinations involving low x low combiners could be due to overdominance and dominance x dominance type of gene action.
Combining ability analysis for yield and yield components in bold grained rice (Oryza sativa L.) of Assam
A prolonged debate has taken place during the past century between advocates of the overdominance or physiological stimulation theory versus the dominant favorable growth factors theory.
Adaptedness and heterosis in corn and mule hybrids
Mopper, unpublished data), but overdominance or frequency-dependent selection could produce the same result.
SPATIOTEMPORAL VARIATION IN LEAFMINER POPULATION STRUCTURE AND ADAPTATION TO INDIVIDUAL OAK TREES
There are varying degrees of dominance, from partial to complete to overdominance.
Part 1 Animal science
deltoides parent contributed favorable alleles to increased height growth and displayed an overdominance effect over the P.
The detection of plasticity genes in heterogeneous environments
Of the 129 significant SNPs, 45 (11) SNPs had additive expression, 18 (2) dominance expression, and 29 (24) SNPs had both additive and dominant expression at 5% ChW (GW) level, of which 27 SNPs had overdominance effects, i.
A whole genome association study to detect additive and dominant single nucleotide polymorphisms for growth and carcass traits in Korean native cattle, Hanwoo
Dominance, overdominance and epistasis condition the heterosis in two heterotic rice hybrids.
HETEROSIS STUDIES FOR VARIOUS MORPHOLOGICAL TRAITS OF BASMATI RICE GERMPLASM UNDER WATER STRESS CONDITIONS
Thus, one locus may show dominance and another may show overdominance, for example.
Application of a gene-based population dynamics model to the optimal egg size problem: why do bivalve planktotrophic eggs vary in size?
The genetic basis of heterosis has been attributed to several factors: overdominance at a single locus (East, 1936), pseudo-overdominance or dominance complementation, and multilocus epistatic interactions (Allard, 1996).
Mapping fiber and yield QTLs with main, epistatic, and QTL x environment interaction effects in recombinant inbred lines of upland cotton
Assertiveness can spill into overdominance, overcontrolling and even bullying behaviour.
Traits that characterise the entrepreneurial spirit
The size traits (wings and legs) showed a consistent pattern of overdominance as the hybrids had mean phenotypic values higher than both parents (see Appendix; [ILLUSTRATION FOR FIGURE 5 OMITTED]).
Sex and speciation: genetic architecture and evolutionary potential of sexual versus nonsexual traits in the sibling species of the Drosophila melanogaster complex

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