P*O*Z*Y# Example lac+ I*p*o+z*Y* FP*0*Z*Y* IP*o*z*Y* -P#O*Z¥Y* I*p*oCz*Y C I*p*o+z*Y

Biology (MindTap Course List)
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Chapter14: Gene Regulation
Section: Chapter Questions
Problem 9TYU: A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous...
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The map of the lac operon is:
POZY
The promoter (P) region is the start site of transcription through the binding of the RNA
polymerase molecule before actual MRNA production. Mutationally altered promoters (P') cannot
bìnd the RNA polymerase molecule. Certain predictions can be made about the effect of P
mutations. Use your knowledge of the lactose system to complete the table below. Insert a "+"
where enzyme is produced and a "-" where enzyme is not produced. Indicate whether the partial
diploid strain is lac* (able to grow on lactose-only medium) or lac( cannot grow in lactose medium).
B-Galactosidase
Permease
Phenotype
(Lac or
Number
Genotype
No Lactose Lactose
No Lactose Lactose
Lac)
P*O*Z*Y#
Example
lac+
I*p*O*z*Y*
a
Ip*o+z*Y*
I*p*oCz*Y
C
I*p*o+z*Y
Transcribed Image Text:The map of the lac operon is: POZY The promoter (P) region is the start site of transcription through the binding of the RNA polymerase molecule before actual MRNA production. Mutationally altered promoters (P') cannot bìnd the RNA polymerase molecule. Certain predictions can be made about the effect of P mutations. Use your knowledge of the lactose system to complete the table below. Insert a "+" where enzyme is produced and a "-" where enzyme is not produced. Indicate whether the partial diploid strain is lac* (able to grow on lactose-only medium) or lac( cannot grow in lactose medium). B-Galactosidase Permease Phenotype (Lac or Number Genotype No Lactose Lactose No Lactose Lactose Lac) P*O*Z*Y# Example lac+ I*p*O*z*Y* a Ip*o+z*Y* I*p*oCz*Y C I*p*o+z*Y
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