Which of these combinations will result is am operon that can never produce beta galactosidse?(a) I^– + P + O^+ + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+(b) I^+ + P + O^C + Z^– + Y^+ + A^+ / I^+ + P+ O^+ + Z^– + Y^+ + A^+(c) I^s + P + O^C + Z^+ + Y^+ + A^+ / I^+ + P+ O^C + Z^+ + Y^+ + A^+(d) I^-d + P + O^+ + Z^+ + Y^+ + A^+ / I^– + P+ O^+ + Z^+ + Y^+ + A^+I had been asked this question in a job interview.Enquiry is from Operons : Lac and Ara in portion Gene Expression : Transcription Prokaryotes of Cytogenetics

Which of these combinations will result is am operon that can never pr

1.	Which of these combinations will result is am operon that can never produce beta galactosidse?(a) I^– + P + O^+ + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+(b) I^+ + P + O^C + Z^– + Y^+ + A^+ / I^+ + P+ O^+ + Z^– + Y^+ + A^+(c) I^s + P + O^C + Z^+ + Y^+ + A^+ / I^+ + P+ O^C + Z^+ + Y^+ + A^+(d) I^-d + P + O^+ + Z^+ + Y^+ + A^+ / I^– + P+ O^+ + Z^+ + Y^+ + A^+I had been asked this question in a job interview.Enquiry is from Operons : Lac and Ara in portion Gene Expression : Transcription Prokaryotes of Cytogenetics
Answer» Correct choice is (b) I^+ + P + O^C + Z^– + Y^+ + A^+ / I^+ + P+ O^+ + Z^– + Y^+ + A^+ Explanation: This is because although this operon is constitutively turned on, yet it has a mutated LAC Z gene which produces beta galactosidase. This mutation EXISTS in both of the loci so it can’t PRODUCE this enzyme even if the operon is on.

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