Lecture 6 - Lecture 6 Migration Friday Jan.17 Reading...

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Lecture 6: Migration Friday, Jan.17 Reading Chapter 7.1 Migration 1
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Learning Objectives 1. Explain why we do not consider migration from the islands to the mainland when calculating the affect of migration on allele frequencies. 2. Use the formula provided to calculate the affect of migration on island allele frequencies. 3. Predict how allele frequencies will change over time for island populations experiencing migration. 4. Explain how migration can hinder adaptation. 2
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Migration What is it? Movement of alleles between populations = gene flow What causes it? Movement of individuals followed by mating movement of gametes followed by fertilization (plants, urchins etc.) What is its effect? Allele frequencies will change Population is not longer in HWE 3
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Migration: Island Model Mainland Migration Island Alleles after = alleles from + alleles from migration residents immigrants 4
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Migration: Island model • p r = freq of A 1 allele in resident population • p m = freq of A 1
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