BIOL3044 Lecture Notes - Lecture 11: Environment Variable, Heritability, Allopatric Speciation
Document Summary
So far, we"ve been focused on the genetics basis of traits: heritability, r = h2s. We will now start thinking about the selection part of the process. Endler (1986) natural selection in the wild. Neutralist school why is there variation: most variation we see are irrelevant to selection. Endler"s book sometimes seen as a manifesto for selectionists: made the argument that natural selection occurs and that it"s important. To document selection, you need good evidence a list of methods to document good evidence. If a trait is under selection for adaptation to environmental variable x, then the trait should correlate with the environment variable x. If the trait is neutral, then it"s uncorrelated with the environment. Pros: this is a simple way to approach things. Cons: almost any trait will correlate with some environmental variable just by chance, environment may induce a change in the trait, rather than the trait adapting to an environment, the environment modifies the trait directly.
