Abstract
When the metabolic Activity of a system under induction is essential to the formation of that system, the response of each cell in a population is sharply dependent upon whether it possesses a minimum unit of the induced activity. As a result, the formation of enzyme by the population is heterogenous. Both the formation and nonformation of enzyme is passed on clonally to the descendants. Two induced systems: the galactoside-permease and [beta]-galactosidase (Cohen and Monod, 1957) of E. coli and the galactozymase of long-term adapting yeast (Spiegelman, 1951) can be understood in terms of this concept for which experimental evidence is presented.

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