What is the difference and can one gene be subject to

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What is the difference, and can one gene be subject to both modes of control? 4. In the table below, state whether or not the genetic regions of the lac operon listed are transcribed in wild-type cells of E. coli: Transcribed in Transcribed in presence of lactose absence of lactose (a) Z gene ____ ____ (b) I gene ____ ____ (c) lac promoter ____ ____ (d) Y gene ____ ____ 5. Would the following genotypes for the E. coli lac operon be non-inducible (non-ind), inducible (ind), or constitutive (con) for β -galactosidase production? (a) I - P + O + Z - (b) I + P + O C Z - (c) I - P + O + Z - /I + P + O + Z + (d) I + P + O C Z - /I + P + O + Z + (e) I S P + O + Z + (f) I + P - O + Z + 6. Describe what effect each of the following mutations would have on induction of β - galactosidase by lactose. (a) A mutation that inactivates the lacI gene (b) A mutation that prevents the product of the lacI gene from binding lactose (c) A mutation that prevents the product of the lacI gene from binding DNA (d) A mutation that inactivates the crp gene (e) A mutation in the operator that prevents the lac repressor from binding
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Evolutionary Genetics 7.A number of mutations affect the expression of the lactose operon in E. coli . Complete the table given below. Use + to indicate that the enzyme is synthesized at greater than basal levels, and 0 to indicate that enzyme is not synthesized. Inducer (IPTG) absent Inducer (IPTG) present β -Galactosidase Permease β -Galactosidase Permease
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