BIOL3044 Lecture Notes - Lecture 22: Reaction Norm, Habitat, Null Hypothesis
Document Summary
We have talked about examples of these already it just wasn"t labeled. We"ve been using reaction norms: the graphs we"ve been using are reaction norms. The lines (blue and red) are the reaction norm. A genotype"s reaction norm is the pattern of its response to the environment: ex. in the graph, if we follow the population from environment. Local adaptation is a case of genotype by environment interaction. It works the other way around - whether or not environment 1 is. Better (easier to grow well in or promotes high fitness) than environment 2 depends on what genotype we"re talking about. To answer the question of gxe, it all depends. The phenomenon where the different genotypes respond differently to variation in the environment: not that they respond to the environment, but that they respond differently from each other, ex. In environment1 , the fitness for population 1 goes up while it goes down for population 2.
