The agouti locus helps determine coat color in mice, and thi…

The agouti locus helps determine coat color in mice, and this phenotype can vary from light to dark between genetically identical individuals. You have discovered a drug that reduces the variation in the agouti phenotype. What is a likely explanation for this drug’s mechanism of action? (Select all that apply)  

A microbiologist isolated a mutant strain of E. coli that is…

A microbiologist isolated a mutant strain of E. coli that is extremely susceptible to bacteriophage infection, by a wide range of bacteriophages. Which of the following genes might she explore as a possible site of the mutation that results in this particular phenotype?