Evolution Chapter 7

reaction norm

a property of a genotype that describes how development maps the genotype into the phenotype as a function of the environment

induced response

adaptive developmental response to a specific environmental signal

directional

favors extreme phenotypes

disruptive

favors two or more phenotypes

clonal organisms

measure reaction norms as properties of genotypes

sexually reproducing organisms

reaction norm can be estimated as the mean value of a family of siblings to changes in the environment

stabilizing

selects against extremes, individuals with average or intermediate phenotypes are favored

genetic correlation

the proportion of phenotypic correlation between two traits that can be attributed to additive genetic effects

phenotypic plasticity

the sensitivity of the phenotype to differences in the environment, measured as the slope of the reaction norm