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Modern Genetic Analysis Chapter 14. Regulation of Gene Transcription Regulation of the Lactose System
Table 14-3. Synthesis of b-Galactosidase and Permease by the Wild Type and by Strains Carrying Different Alleles of the I Gene

|  | b-GALACTOSIDASE (Z) | PERMEASE (Y) |

Strain | Genotype | Noninduced | Induced | Noninduced | Induced | Conclusions

1 | I+Z+Y+ |  | + |  | + | I+ is inducible
2 | IsZ+Y+ |  |  |  |  | Is is always repressed
3 | IsZ+Y+/F I+ |  |  |  |  | Is is dominant to I+

NOTE: Bacteria were grown in glycerol (no glucose present) with and without the inducer IPTG. Presence of the indicated enzyme is represented by +; absence or low levels, by .

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