Experimental reverse evolution, in which a population is readapted to an ancestral environment, can probe the nature and extent of evolutionary memory. A new study shows that standing genetic variation is key to this memory in experimental Drosophila populations, where selection drives rapid but incomplete convergence to ancestral genotypes.
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Desai, M. Reverse evolution and evolutionary memory. Nat Genet 41, 142–143 (2009). https://doi.org/10.1038/ng0209-142
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DOI: https://doi.org/10.1038/ng0209-142
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