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.

Question

Quizplus · Accepted Answer

The high co-transduction rates between X and Y (70% and 68%) suggest they are close to each other, with X being in the middle due to its lower co-transduction rate with Z (5%) compared to Y's with Z (1%), indicating X is closer to Y than to Z.

Three Genes (X, Y, and Z)are in the Same Region