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| Modern Genetic Analysis Chapter 14. Regulation of Gene Transcription Regulation of the Lactose System Figure 14-9. The recessive nature of I mutations demonstrates that the repressor is transacting. Although no active repressor is synthesized from the I gene, the wild-type (I+) gene provides a functional repressor that binds to both operators in a diploid cell and blocks lac operon expression (in the absence of an inducer).

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