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Reverse evolution and evolutionary memory

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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Figure 1: Schematic of the effect of selective landscape on evolutionary memory.


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Desai, M. Reverse evolution and evolutionary memory. Nat Genet 41, 142–143 (2009).

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