gene action


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Related to gene action: additive gene action

gene action

The operation of genes in determining the whole body constitution (phenotype) of an individual.
References in periodicals archive ?
Keywords: Bread wheat, gene action, epistasis, generation mean analysis.
The proper knowledge concerning important genetic parameters like combining ability estimates, types of gene action and comparative level of genetic variances are important in improving plant traits (Khan et al., 2009).
Furthermore, both additive and nonadditive gene action were involved in the inheritance of almost all the traits studied.
This means that gene action, and its results, cannot be understood from looking at gene usage in the dimensions within cells alone.
Genetic effects observed in our study, specifically those involved in the inheritance of the resistance to nematodes, may be explained to a large extent by the additive-dominant model, represented by the sum of the effects of the mean (m), additive gene action (a), and dominance (d), since the correlation between the averages estimated by the model and the averages obtained from the generations was high (R2 = 0.9745).
However, a preponderance of dominance gene action was observed in the inheritance of this trait in both environments.
Representing the inheritance pattern with the role of additive gene action conferring GCA (as parents with higher estimates) and non-additive gene action inferring SCA (higher interaction of hybrids) leads to the identification of superior genotypes [5, 7].
The variance due to sca was higher than that of due to gca for all the characters indicating the predominant role of nonadditive gene action except for fruit girth for which additive gene effect was more important.
"Studying color variation in cats provides the opportunity to uncover new principles of gene action and interaction that may have unexpected applications to understanding developmental and morphologic variation in natural populations, including humans."
Although, the mode of gene action in these two research works are different, both of these studies support the lack of additive mode of gene action and segregation of major gene in Baluchi sheep breed.
These results indicated that calyx length was under the control of non-additive gene action. But in [BC.sub.3][F.sub.2] and [BC.sub.3][F.sub.3] generations of the cross MDU 1 x Solanum viarum, high heritability with moderate genetic advance was observed for this trait.