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CH 15_student_outine - How Organisms Evolve How Organisms...

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Unformatted text preview: How Organisms Evolve How Organisms Evolve Chapter 15 Chapter 15 Using Knowledge of Evolution to Fight Disease • • • • The Causes of Evolution 1. 2. 3. 1. 1.- - Population Genetics and Evolution • – – • – • – Hardy-Weinberg Equilibrium • • • 1. 2. 3. 4. 5. • Allele Frequency & Genotype Frequency • • • • • • • Parents: Genotype freq Allele freq Kids: Genotype freq Allele freq Causes of Evolution: Mutation • • • • Mutations Occur Spontaneously Bacterial colonies never exposed to antibiotics Transfer colonies to 3 dishes containing streptomycin Only streptomycin-resistant colonies grow, in same positions Figure 15-1 Causes of Evolution: Gene Flow • • • Causes of Evolution: Genetic Drift • – – • • Population Size & Genetic Drift Large population size Small population size Figure 15-2 Genetic Drift Founder effect Populatio n bottleneck Chance events Genetic Bottlenecks Reduce Variability Figure 15-3 Founder Events Increase Likelihood of Rare Alleles • • Figure 15-4 Causes of Evolution: Non-random Mating Non-random mating • • – • Figure 15-6 Sexual Selection • • Figure 15-7 Causes of Evolution: Natural Selection • • • – – – Important Points Re: Natural Selection • – – • – – •...
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CH 15_student_outine - How Organisms Evolve How Organisms...

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