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Evolutionary theory predicts the direction and magnitude of evolutionary change

Evolutionary theory predicts the direction and magnitude of evolutionary change. Change in trait mean (phenotype) of a population from one generation to the next Change in allele frequency (genotype) from one generation to the next. What will beak size be in the next generation?.

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Evolutionary theory predicts the direction and magnitude of evolutionary change

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  1. Evolutionary theory predicts the direction and magnitude of evolutionary change Change in trait mean (phenotype) of a population from one generation to the next Change in allele frequency (genotype) from one generation to the next

  2. What will beak size be in the next generation? Selection differential = S = 10.1mm – 9.4mm = 0.7mm Response to selection = R = 9.7mm – 9.4mm = 0.3mm

  3. The “breeder’s equation” h2 = 0.77 R = S x h2 Predicted R = 0.7mm x 0.77 = 0.5mm Observed R = 0.3mm Estimated heritability from parent/offspring regression = 0.77 Realized heritability = R/S = 0.43 How might these discrepancies be explained, and how might the explanation(s) be tested experimentally?

  4. Heritabilityfrom Falconer and Mackay, Quantitative Genetics Back-fat Body weight Body weight Food conversion Bristle number Tail length Butterfat % Egg weight Body size Ovary size Weight gain Body weight Milk yield Litter size Egg number Egg number Litter size Pigs Mice Cattle Chickens Drosophila What does this tell us?

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