Bio 108 Topic Summary Lectures 1-5

Bio 108 Topic Summary Lectures 1-5 - Effect of gene freq No...

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Biology 108 TOPIC SUMMARY Lectures 1-5 Lecture 1 & 2: What is Population Genetics? Evolution by Natural Selection. Central Dogma. Lamarckism vs. Plasticity Distinguishing Lamarckian & Darwinian models of adaptive evolution. Evolutionary Synthesis Lecture 3: Fitness Fitness Components Trade-off between fecundity and development time. Lecture 4: Hardy-Weinberg ratios – a null hypothesis linking gene freq to genotype freq. Proof – H-W ratios achieved in 1 gen and gene frequencies remain constant. Calculating H-W expectation from data Testing fit of data to H-W Statistical Significance and Power Lecture 5 : When H-W assumptions violated - effects on fit to H-W, and on gene freq change. Assumption violated Effect on H-W ratios
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Unformatted text preview: Effect of gene freq No differential selection Depends on type of selection Depends on type of selection Random Mating XS homs: Pos assort mating / inbreeding / spatial genetic structure. XS hets: neg assort mating Usually no change No immigration XS homs (if source popln is genetically different). Moves towards source popln Large popln Usually no effect Random change genetic drift No mutation No measurable effect Only measurable if mutant allele v. rare Non-overlapping gens Takes > 1 gen to get to H-W No effect Autosomal inheritance Maternal not relevant Haplodiploidy H-W ratios in females. No effect No initial sex difference in allele freq. Takes >1 gen to get to H-W No effect...
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