9 BISC_120 EvolMech2

9 BISC_120 EvolMech2 - Evolutionary Mechanisms 2 23.3-23.4...

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1 Evolutionary Mechanisms 2 23.3-23.4 2 Evolutionary Processes • Mutation and sexual recombination produce new variation • Selection, drift and gene flow alter allele frequencies in a population 3 Evolutionary Processes • Mutation and sexual recombination produce new variation • Selection, drift and gene flow alter allele frequencies in a population 4 Natural Selection • Differential survival and/or reproduction results in certain alleles being passed to the next generation in greater proportions
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5 Evolutionary Processes • Mutation and sexual recombination produce new variation • Selection, drift and gene flow alter allele frequencies in a population 6 Random Genetic Drift • Changes in allele frequencies within populations which result from chance variation in individual survival and reproduction • Most important in small populations • Can result in maladaptive evolution 7 Populations of Infinite Size AA Aa aa AA Aa aa Generation 1, So far, we’ve assumed that alleles are drawn from the gene pool in their exact frequencies AA Aa aa AA Aa aa Generation 2, A a a A A a A a A A a a “Gene pool,” 8 Sampling Error Imagine a bowl filled with: 50% black marbles and 50% red marbles
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9 BISC_120 EvolMech2 - Evolutionary Mechanisms 2 23.3-23.4...

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