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Unformatted text preview: the A allele in population x in the next generation (p x t+1 ) is just the frequency in the nonmigrant portion (= p x [1m]) plus the frequency in the migrant portion (p y m). Thus: p x t+1 = p x t [1m] + p y m . The change in allele frequency due to gene flow is p = (p x t+1 )  p x t which is just; [p x t [1m] + p y m]  p x t Multiplying through and canceling terms leaves us with: p = m(p x t p y t ) . This makes intuitive sense: the change in p depends on the migration rate and the difference in p between the two populations. If we considered a grid or array of populations and focus on one of those populations as the recipient population with all other populations contributing equally to it, then p y would be replaced by the average p for all the other populations. Many scenarios are possible....
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 Fall '10
 JessicaDigirolamo
 Microbiology, Genetics, Population Genetics

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