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Science 6 January 1995:
Vol. 267. no. 5194, pp. 87 - 90
DOI: 10.1126/science.7809610
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Articles

Science, Vol 267, Issue 5194, 87-90
Copyright © 1995 by American Association for the Advancement of Science

articles

Experimental tests of the roles of adaptation, chance, and history in evolution

M Travisano, JA Mongold, AF Bennett, and RE Lenski

Center for Microbial Ecology, Michigan State University, East Lansing 48824.

The contributions of adaptation, chance, and history to the evolution of fitness and cell size were measured in two separate experiments using bacteria. In both experiments, populations propagated in identical environments achieved similar fitnesses, regardless of prior history or subsequent chance events. In contrast, the evolution of cell size, a trait weakly correlated with fitness, was more strongly influenced by history and chance.


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