BIOLOGY 1M03 Lecture 1: BIOLOGY 1M03 chapter 24: evolution by natural selection
20 Apr 2016
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Evidence of evolution (change through time, extinction, vestigial traits, inter-relatedness) Evidence of natural selection (industrial melanism, antibiotic resistance) Natural selection affects individuals, but evolution occurs in a population over time (epigenetics) Darwin and wallace went a major step further and proposed that change in species over time is based on natural selection acting on heritable variation among individuals. Darwin described evolution as descent with modification (change over time produced modern species from ancestral species) Therefore the species: change through time, and are related by common ancestry. Fossils: show species that were around in the past; species change through time; sudden changes in what species are doing over time (bipedal locomotion) Extinction: many fossil provides evidence for extinct species, those that are no longer living. Limits: going back hundreds of years, ability to extract is limited. Prehistoric turds and ancient dna: extract prehistoric poop and compare it to the species today o.
