BIO LECTURE 4 NOTES.docx - BIO LECTURE 4 NOTES Evolution Selection Maintaining Variation Lecture 04 Chapter 21 If a population is not in Hardy-Weinberg

BIO LECTURE 4 NOTES.docx - BIO LECTURE 4 NOTES Evolution...

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BIO LECTURE 4 NOTES Evolution Selection & Maintaining Variation Lecture 04 Chapter 21 If a population is not in Hardy-Weinberg equilibrium, we can conclude that: evolution has occurred because one or more of the assumptions of the Hardy-Weinberg equilibrium has been violated. The Agents of Microevolution 1. Mutation 2. Gene Flow (aka Migration) 3. Genetic Drif 4. Natural Selection • (Nonrandom Mating) 2. Gene Flow – aka Migration Gene flow – Movement of alleles across different populations – May be the movement of individuals (e.g. seeds) or gametes (e.g. pollen) • Life history, behaviour may enhance gene flow • Dispersal agents (e.g. blue jays) enhance gene flow 3. Genetic Drif Genetic drif Random change in allele frequencies Most important in smaller populations (populations are infinitely large) Can wipe away genetic variation Reduces genetic variability
2 methods of genetic drift Population bottleneck Reduction in alleles due to population reduction Founder effect

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