<p>After providing a compelling argument for why divergence hitchhiking is unlikely to explain genomic islands of divergence, Yeaman investigates the evolution of genome architecture, or mutations that rearrange the genome, as a potential explanation. This analysis begins with an elegant simplified model, and then expands to include a simulation approach with fewer assumptions. The model estimates the time required for a population to evolve a clustered architecture, which depends on the genome size, population size, migration rate, rearrangement rate, and length of completely linked genomic segments. Yeaman emphasizes that the model, or heuristic, is only an approximation that should not be expected to give exact values. He uses the model to demonstrate that clustering can occur in a relatively short time, given the right model parameters. It is difficult to judge how realistic these parameters are, however, especially the values for the rearrangement rate. Still, Yeaman has more or less proven that under certain scenarios, genome architecture can evolve as a result of divergent selection, and that this can lead to genomic islands of divergence.</p>
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