BIOL3044 Lecture Notes - Lecture 1: Reaction Norm, Chlamydomonas, Genetic Variation
Document Summary
How populations deal with or fail to deal with environmental change. Genetic variation and limits to adaptation in response to environmental change. Experimental evolution: doing long term selection experiments on short lived organisms, something we can propagate for hundreds of generations, ex. Three treatments: general design consists of three treatments, 2 environments + and a third environment which is an alternation between the two environments. Exposed to 2 different temperatures (32c and 42c) The population exposed to 42c (s42): fitness in 42c is high, but not very high at 32c. The population exposed to 32c (s32): fitness in 32c is high, but has low fitness at 42c. At these two different temperatures, we have 2 specialist populations that have evolved, each adapting to their own habitat. In this case, generalist e. coli is less fit than specialist. Chlamydomonas in light and dark (sometimes there is a partial drawback) Chalmydomonas; one done in the light, other done in the dark.
