Given the following genotypes of E. coli strains, predict whether the lacZ gene

Question

Given the following genotypes of E. coli strains, predict whether the lacZ gene will be inducibly expressed, constitutively expressed, or permanently repressed in the presence of lactose.

Genotype                    Inducible                      Constitutive                 Repressed

I-O+Z+                                                                     

I+OCZ+                                                                    

ISOCZ+                                                                    

I-O+Z+/F'I+                  

I-O+Z+/F'OC                    

I-O+Z+/F'OCI+

Explanation / Answer

Genotype Inducible Constitutive Repressed I-O+Z+ - + - I+OCZ+ - + - ISOCZ+ - + - I-O+Z+/F'I+   + - - I-O+Z+/F'OC + - - I-O+Z+/F'OCI+ + - -

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