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###### 8. Mutants were instrumental in elaborating the model for regulation of the lac operon: a. Discuss why Piac- and lacO mutants are cis-dominant but not trans-dominant:b. Explain why lacl mutants are trans-dominant to the wild-type lacl allele but lacl-mutants are recessive.C. Discuss the consequences of mutations in the repressor gene promoter (the promoter of the Lac gene) as compared with mutations in the structural gene promoter (promoter of the Lac Z gene)_

8. Mutants were instrumental in elaborating the model for regulation of the lac operon: a. Discuss why Piac- and lacO mutants are cis-dominant but not trans-dominant: b. Explain why lacl mutants are trans-dominant to the wild-type lacl allele but lacl-mutants are recessive. C. Discuss the consequences of mutations in the repressor gene promoter (the promoter of the Lac gene) as compared with mutations in the structural gene promoter (promoter of the Lac Z gene)_

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