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Cross-posted at Denim and Tweed. In the course of adaptive evolution - evolutionary change via natural selection - gene variants that increase the odds of survival and reproduction become more common in a population as a whole. When we're only talking about a single gene variant with a strong beneficial effect, that makes for a...

By Matthew Cobb Some religious folk accept that micro-evolution can be observed - shifts in allele frequency due to natural selection - but argue vociferously that no one has ever seen one species evolve out of another. We know that one reason for this apparent lack of evidence for speciation is due to the time-scales...