additive gene action


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additive gene action

[¦ad·ə·div ¦jēn ‚ak·shən]
(genetics)
A form of allelic interaction in which dominance is absent, resulting in a heterozygote that is intermediate in phenotype between homozygotes for the alternative alleles.
The cumulative contribution made by all loci in a group of nonallelic genes to a polygenic trait.
References in periodicals archive ?
Number of grains per row, number of grains per ear and 100-grains weight of maize genotypes studied in current research were found under the control of additive gene action whereas, El-Badawy, (2012) reported the preponderance of additive and additive x additive genetic effects for number of grains per row, number of grains per ear and grain yield.
This could be explained from the point of view of gene action since gca is mostly due to additive gene action whereas sea is mostly due to overdominance and epistasis.
4:5] populations was additional evidence that both major and minor genes with additive gene action controlled resistance in soybean to Rhizoctonia root and hypocotyl rot, and that moderately susceptible cultivars also contributed resistant alleles.
The presence of fixable additive gene action in these traits permits early generation selection for tailoring drought tolerant wheat.
The observation that more than 60% of the RILs had higher oil than the high oil parent suggests that, in addition to the main effect of additive gene action, epistasis might play an important role.
The GCA is a measure of the additive gene action, while SCA is assumed a deviation from additivity.
Generation means analyses showed that additive gene action plays a role in the resistance to G.
The variations among genotypes for earliness and plant height were controlled by non-additive gene action, while morphological and seed yield traits were governed by additive gene action.
Under the assumptions of large population size (and thus no drift during selection), additive gene action, equal allelic effects among loci, and initial allele frequencies of 0.
Spike length dry biomass per plant at maturity grains per spike 1000-grain weight and grain yield per plant exhibited high narrow sense heritability due to the existence of additive gene action with partial dominance suggesting that these traits might be useful for the development of high temperature stress tolerant varieties by modified pedigree selection method.
Additive gene action has also been reported for hull percentage (Vranceanu and Stoenescu, 1969.
Additive gene action for this trait appeared to be expressed only under normal moisture level as revealed by the significance of D while these effects were absent in moisture stress and only non-additive effects H1 and H2 were significant.