BIOL108 Lecture Notes - Lecture 5: Pesticide, Antimicrobial Resistance, Selective Breeding

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Lien Luong

Document Summary

Biol 108 - lecture 5 - descent with modification. Heritable variation: exists within and between species, phenotypic. Genetic make-up: for natural selection to act on variation, must be seen by the environment (expressed in phenotype) and be heritable (caused by genotype) However, not all genetic things are heritable: variation is random, but not natural selection. It selects for individuals that can survive and reproduce. Sources of variation: mutation: random changes to dna, meiosis. Selective agent: always acting (apply pressure) upon the individual, component of natural environment that consistently causes differential survival and/or reproduction. Eg. heat, stress, drought: the intensity with which the selective agent acts on a population to evolve aka selection pressure. Abiotic: temperature, rainfall: example: white rabbits vs. brown rabbits and their surrounding environment. Evidence for evolution: fossil record, comparative embryology and anatomy, biogeography, molecular evidence, genetic change over item, dating of sedimentary rock layers.