2012年5月31日星期四
developmental network models - a new evolutionary model for phenotypic variation
http://onlinelibrary.wiley.com/doi/10.1111/j.1558-5646.2012.01649.x/abstract
We develop an explicit gene network model with three components : some genes can receive environmental cues about the adult selective environment , some genes that interact repeatedly to determine each others ’ final state , and other factors that translate these final expression states into the phenotype . We show that the evolution of phenotypic plasticity is an important determinant of mutational patterns , genetic variance , and evolutionary potential of a population . Phenotypic plasticity tends to lead to populations with greater mutational variance , greater standing genetic variance , and , when the optimal phenotypes of two traits vary in concert , greater mutational and genetic correlations . However ,plastic populations do not tend to respond much more rapidly to selection than do populations evolved in a static environment . We find that the quantitative genetic descriptions of traits created by explicit developmental network models are evolutionarily labile , with genetic correlations that change rapidly with shifts in the selection regime .
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