091707_EvolutionaryMechanisms

091707_EvolutionaryMechanisms - 9/17/2007 Intro to...

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9/17/2007 1 Intro to Organismal Biology 9/17/07 Announcements 2 1. Quiz 1 Wednesday 9/19 in class (~15 min.) 2. Please bring laptops to lab this week 3. Lab manuals given out in class Questions? 3 Today’s class Hardy-Weinberg Equilibrium Evolutionary mechanisms: not just natural selection (Relevant reading: Ch. 23) 4 Population genetics: REVIEW Population genetics: study of changes in the genetic makeup of a population Hardy and Weinberg in 1908 independently developed a way to study population genetic changes: They modeled a population that is NOT evolving (no change in the gene pool over time) 5 C R C R C R C W C W C W Homozygote Heterozygote Homozygote Population of 500 plants: 180 red, 240 pink, 80 white Calculate: 1) genotype frequencies 2) allele frequencies 6
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9/17/2007 2 C R C R C R C W C W C W 180 240 80 Genotype frequencies: C R C R : 180 /500 = 0.36 or 36% C R C W : 240 /500 = 0.48 or 48% C W C W : 80 /500 = 0.16 or 16%
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091707_EvolutionaryMechanisms - 9/17/2007 Intro to...

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