evo 3 drift slides.pdf - Drift gene flow mutation nonrandom...

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Drift, gene flow, mutation & non- random mating or Never trust an aqua-weasel
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ROADMAP for drift etc Mutation: small but vital Non-random mating: positive and negative assortative mating and inbreeding. Gene flow. Genetic Drift: bottlenecks and founders. Mutational meltdown. Extinction vortex. Effective population size.
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1. Large Genetic Drift 2. Isolated Gene Flow 3. No mutations 4. Random mating 5. No Selection Natural selection The five conditions for the Hardy Weinberg principle to apply. Violating these three assumptions is likely to lead to evolutionary change.
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1. Large 2. Isolated 3. No mutations Little on its own but vital 4. Random mating 5. No Selection The five conditions for the Hardy Weinberg principle to apply. Most mutations are harmful or neutral . Mutations are rare but genomes and populations can be large.
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Genetic variation makes evolution possible. Variation comes from: Mutation etc. producing new alleles, genes or chromosomes Sexual reproduction producing new combinations of genes. Mutation is a weak force but a vital one
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Textbook animation showing how meiosis produces new allele combinations
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1. Large 2. Isolated 3. No mutations Little on its own but vital 4. Random mating Changes genotype freqs. 5. No Selection The five conditions for the Hardy Weinberg principle to apply.
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Positive assortative mating Reduces heterozygosity This is a very strange example.
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