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Phylogeny Notes - ANNOUNCEMENTS Quiz 4 next Monday Todays...

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3/20/2009 1 ANNOUNCEMENTS Quiz # 4 next Monday 3/23/09; Today’s class notes will include guidelines for Today s class notes will include guidelines for your study; Your in-class work on HWE returned to folders; extra points will be added to your midterm score. l l f ld !!!! Please, clean up your folders!!!! Last time: Objectives: 1 Determine whether evolution occurs Genetic drift; Gene flow. 1. Determine whether evolution occurs by mechanisms other than selection. Campbell, Ch. 23, pp.475-485 2. Compare and contrast population Campbell, Ch. 23, pp.475 485 Genetic Drift outcomes resulting from selection versus random events. (random events in environment) Biological Species Concept: A f l i A group of populations capable of interbreeding AND producing viable and fertile offspring Campbell, Ch. 24, pp. 487-492 Campbell, Ch. 24, pp. 487 492
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3/20/2009 2 Concept check : Clicker Q1: Can gene flow occur between... A. ... different species? B. ... different populations of the same species? C. ... different organisms within a population? Objectives 3/20/2009: Objectives, 3/20/2009: 1. Interpret evolutionary relatedness using 1. Interpret evolutionary relatedness using phylogenetic trees. 2. Use phylogenetic analysis to evaluate evidence for evolution. 3. Use phylogeny to explain the erroneous view that evolution is a linear progression view that evolution is a linear progression from primitive to advanced species.
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3/20/2009 3 Divergence, Speciation, Adaptation Adaptation: A trait that makes an individual better suited to its environment will experience better survival and its environment will experience better survival and reproduction differentially “selected” by the environment ll l l b l h l Will ultimately become prevalent in the population. (Campbell, p. 456) Divergence: Accumulation of genetic change (adaptations) ti i l ti (d t d t ti l ti over time in populations (due to random mutations, selection, drift, flow). Speciation: Origination of new species resulting from reproductive isolation of populations that have diverged of populations that have diverged.
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