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New York: W. Freeman ; Search term Solved Problems This set of four solved problems, which are similar to Problem 4 at the end of this chapter, is designed to test understanding of the operon model. Here we are given several diploids and are asked to determine whether Z and Y gene products are made in the presence or absence of an inducer.
Use a table similar to the one in Problem 4 as a basis for your answers, except that the column headings in order will be: Z gene—inducer absent; Z gene—inducer present; Y gene—inducer absent; Y gene—inducer present. One way to approach these problems is first to consider each chromosome separately and then to construct a diagram. However, the structural genes linked to the good promoter are defective; thus, no active Z product or Y product can be produced.
However, only the Z gene from this chromosome is intact. In the presence of an Is repressor, all wild-type operators are shut off, both with and without an inducer.
Therefore, the first chromosome will be unable to produce any enzyme. However, the second chromosome has an altered Oc operator and can produce enzyme in both the absence and the presence of an inducer. Freeman and Company.
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