Reports

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

Science  06 Jan 1995:
Vol. 267, Issue 5194, pp. 87-90
DOI: 10.1126/science.7809610

Abstract

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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