Three genes (X, Y, and Z) are in the same region of a bacterial chromosome. To determine the order of these genes, you infect X?Y?Z? cells with a lysate from wild-type cells infected with a generalized transducing phage. When X+ cells are selected, 70% of cells are also Y+ and 5% of cells are Z+. When Y+ cells are selected, 68% of cells are also X+ and 1% are Z+. What is the relative arrangement of the three genes?
A) Z is in the middle, but closer to X.
B) Y is in the middle, but closer to Z.
C) X is in the middle, but closer to Y.
D) X is in the middle, but closer to Z.
C) X is in the middle, but closer to Y.
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a. nerve b. nerve cord c. nerve net d. ganglia e. brain
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a. Yes b. No
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