Unformatted text preview: can't "see" selection unless we are lucky enough to catch a population in the middle of the period of rapid change. What affects the rate of change under selection? Recall that ∆ p = p t+1 p t ∆ p = [(w AA p2 + w Aa pq)/(w AA p2 + w Aa 2pq + w aa q2)]  p . With some simple algebra we can rearrange this equation to: ∆ p = (pq[p(w AA w Aa ) + q(w Aa w aa )])/(w AA p2 + w Aa 2pq + w aa q2) Note that ∆ p will be proportional to the value of pq. This value (pq) will be largest when p=q=0.5 or, in English, when the variance in allele frequency is greatest. This is a simplified version of the main point of the fundamental theorem of natural selection modestly presented by R. A. Fisher....
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 Fall '10
 JessicaDigirolamo
 Microbiology, Evolution, 1  pt, wAA p2, waa q2, wAa pq

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