?Lac Operon In E. coli, three closely linked loci have been identified. The loci

Question

?Lac Operon

In E. coli, three closely linked loci have been identified. The loci are symbolized by d, m, and s. Wild type alleles are superscripted with a plus, while mutant alleles are superscripted with a minus. When an inducer is present or absent, the level of Enzyme A is measured and the results for several different strains are given below

Structural gene?

Regulator?

Operator?

Please help, I'm lost.

From the information given, determine which of the genes is the structural gene for Enzyme A, which is the regulator and which is the operator. Note: There are no super-repressor mutants and assume all romoters are wild type! Phenotype (level of Enzyme A) bsence of Inducer resence of Inducer Genotype high d+ m+ S+ d+ m- S+ d- m+ s+ d+ m+ S- d+ m+ s+ /d- m- s- d+ m- S+ /d- m+ s- none none high high none high high high none none high high high high high high high d+ m-s- /d- m+ s- d- m+ s/d+ m- s-

Explanation / Answer

According to the given data:

Structural Gene is m+

Regulator gene is d+

Operator gene is s+

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