Below are the lac operon genotypes of certain E. coli strains. In the spaces bel

Question

Below are the lac operon genotypes of certain E. coli strains. In the spaces below, indicate whether the lac operon will be inducible, noninducible, or constitutive. Assume that the glucose levels are low in all cases. For the partial diploid strains (part d and e) describe the overall phenotype of the cell; do not provide a separate answer for each copy of the lac operon in the cell. Note that IS is dominant to I+, I+ is dominant to I-, and Oc is dominant to O+. a.I- P+ O+ Z+ Y+ A+ b.IS P+ O+ Z+ Y+ A+ c.I+ P- OC Z+ Y+ A+ d.IS P+ O+ Z+ Y+ A+ (F’ plasmid) I+ P+ OC Z+ Y+ A+ (Chromosome) e.I+ P+ O+ Z- Y+ A+ (F’ plasmid) I- P+ O+ Z+ Y+ A+ (Chromosome)

Explanation / Answer

a.I-P+ O+ Z+Y+ A+    constitutive

b. Is P+ O+ Z+ Y+ A+    non-inducible

c. I+ P- Oc Z+ Y+ A+    non-inducible

d. Is P+ O+ Z+ Y+ A+/I+ P+ Oc Z+ Y+ A+    constitutive

e. I+ P+ O+ Z- Y+ A+/I- P+ O+ Z+ Y+ A+    inducible

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