We found a marginally significant positive correlation between fitness in the two environments, indicating that a low cost of the lacI‐ mutation in glucose was, if anything, associated with an increased benefit in lactose (Figure 3 ; Spearman's rank correlation, rho = 0.73, p = .021).
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The cost of evolved constitutive <i>lac</i> gene expression is usually, but not always, maintained during evolution of generalist populations.
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