F13 lecture 21 v2

G high bristle number are not present tradeos between

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Unformatted text preview: discussed previously •  rela,ve fitness is used –  fitness of each individual is divided by the average fitness of the popula,on (different calcula,on than for w for genotypes; see previous lectures) •  selec,on operates through rela,ve fitness, not through absolute numbers of offspring produced e.g. 1.20 y = 0.0205x + 0.2469 R² = 0.08578 rela,ve fitness 1.00 0.80 0.60 0.40 0.20 0.00 5 10 15 phenotypic measure 20 25 directional selection (shifts mean and decreases variance) stabilizing selection (no change in mean; decreases variance) disruptive selection (does not change mean; increases variance and eventually may result in a bimodal distri...
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This document was uploaded on 02/27/2014.

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