ThingsToKnow4-2008

# ThingsToKnow4-2008 - Things to know for Exam 4 Selection...

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Things to know for Exam 4 Selection You should make sure you understand the single-locus selection models. Phenotypic Evolution Equations: V p = V g + V e h 2 = V a /V p S = (average of selected parents) – (average before selection) R = (average at start of next generation) – (average at start of this generation) R = h 2 S R=V a b where b is the “selection gradient” (slope of fitness function) R 1 = V a b 1 + Cov a b 2 Concepts: You should understand how the combined effect of many genes generates a bell-shaped distribution of phenotypes. You should understand how to separate the effects of genetic vs. environmental variance You should have some familiarity with the distinction between additive variance and dominance variance. You should know how to estimate the heritability of a trait using offspring-midparent regressions. You should know how to apply the breeder’s equation to predict the selection response from real data.

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