Interrupted Mating Experiments Were Done with Four Different Hfr Bacterial

question 25

Essay

Interrupted mating experiments were done with four different Hfr bacterial strains H, 1, 2, and 3 to determine the order of integrated F factor genes in the recipient. From the gene maps of the four strains given here, the following alignment was made: Order of gene transfer: H thr-pro-lac-pur-gal 1 his-gly-thi-thr 2 his-gly-thi-thr-pro-lac 3 pro-lac-pur-gal-his-gly Alignment of genes: H thr-pro-lac-pur-gal 1 his-gly-thi- thr 2 his-gly-thi-thr- pro-lac 3 pro-lac-pur-gal-his-gly What does this alignment imply about the structure of the Hfr bacterial chromosome?

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