In some cases, such as the human population, it is clear that the population size has not stayed constant in time. This motivates the consideration of a version of the Wright-Fisher model in which the number of diploid individuals in generation t is N(t), but the rest of the details of the model stay the same. That is, in the case of no mutation, generation t is built up by choosing with replacement from generation t − 1. Reversing time leads as before to a coalescent.
KeywordsEffective Population Size Population Subdivision Island Model Distinct Individual Constant Population Size
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