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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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