Lecture 9 - Lecture 9 2 1) Breeders Equation Predict the...

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Lecture 9 1) Breeder’s Equation – Predict the evolutionary frequency of phenotype. [R = h 2 S] a) Study the evolution of quantitative traits and the variance of the distribution. b) H 2 = Slope of the parent offspring regression c) S = Difference between selection group and population mean at start, all in the same generation (before Reproduction). (X sel – X pop T ) d) R = Difference between population mean between generations after and before selection. (Describes the shift in the mean). (X pop T+1 – X pop T ) e) Assumptions i) Slope of h 2 is between 0 and 1 ii) Environment experienced by the parents is the same as experienced by the offspring. 2) Grants’ Experiment – Measuring beak depth of finches on Daphne Major. a) During the drought, decline in finch population, abundance of seeds, and the seeds that were left which were hard seeds, which are usually neglected by finches i) After drought, there were less finches left, and the mean shifted. 3)
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Lecture 9 - Lecture 9 2 1) Breeders Equation Predict the...

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