Lecture 8 - 1 Lecture 8 Genetic Drift Wednesday Jan.23rd...

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Lecture 8 Genetic Drift Wednesday, Jan.23rd Reading: Chapter 7.2 1
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Learning Objectives 1. Identify the three types of drift and differentiate between them. 2. Explain the relationship between population size, random fixation of alleles, heterozygosity and genetic divergence. 3. Define and calculate effective population size and consider it’s implications for wildlife conservation 2
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Review HWE is a null model that assumes 1. There is no selection 2. There is no mutation 3. There is no migration 4. There are no chance events (I.e. genetic drift) 5. Individuals choose their mates at random If a population is NOT in HWE, then one of the assumptions has been violated, and the population is evolving 3
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Genetic drift: A change in allele frequencies due to chance events or sampling error Changes in allele frequency are random and are not the result of fitness advantages/disadvantages 4
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Types of Genetic Drift Founder Effect Population bottlenecks Continuous fluctuations Pop size Pop size 5
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