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Published byPreston Dawson Modified over 9 years ago
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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
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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
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The “breeder’s equation” R = S x h 2 h 2 = 0.77 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?
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Heritability from Falconer and Mackay, Quantitative Genetics Cattle Pigs Chickens Mice Drosophila Egg number Body weight Litter size Weight gain Food conversion Back-fat Milk yield Butterfat % Body weight Tail length Litter size Egg number Egg weight Body weight Ovary size Body size Bristle number What does this tell us?
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