Additive-Multiplicative Approximation of Genotype-Environment Interaction
AUTOR(ES)
Gimelfarb, A.
RESUMO
A model of genotype-environment interaction in quantitative traits is considered. The model represents an expansion of the traditional additive (first degree polynomial) approximation of genotypic and environmental effects to a second degree polynomial incorporating a multiplicative term besides the additive terms. An experimental evaluation of the model is suggested and applied to a trait in Drosophila melanogaster. The environmental variance of a genotype in the model is shown to be a function of the genotypic value: it is a convex parabola. The broad sense heritability in a population depends not only on the genotypic and environmental variances, but also on the position of the genotypic mean in the population relative to the minimum of the parabola. It is demonstrated, using the model, that GXE interaction rectional may cause a substantial non-linearity in offspring-parent regression and a reversed response to directional selection. It is also shown that directional selection may be accompanied by an increase in the heritability.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1206270Documentos Relacionados
- Multiplicative Genotype-Environment Interaction as a Cause of Reversed Response to Directional Selection
- Genotype-Environment Interactions: A Reply
- Heterosis Associated with Genotype-Environment Interactions
- Prediction of Hevea progeny performance in the presence of genotype-environment interaction
- Genotype-Environment Interactions and the Maintenance of Polygenic Variation