Answer:
I suggest the complete question is
What is the pattern of expression of β-galactosidase in lacI- cells and why?
A.constitutive expression, because there is norepressor
B. no expression, because the β-galactosidase gene is defective
C. constitutive expression, because the galactoside permease gene is defective
D. no expression, because lactose is absent
The CORRECT ANSWER for pattern of Expression is A
A.constitutive expression, because there is norepressor
Explanation:
LacI- cells have a defective repressor gene. This wil cause the lacZ gene to be expressed even in the absence of lactose.
(It's worthy to Note that when glucose is absent, lacZ is fully expressed)
