问答题

Using interrupted mating experiment, 5 Hfr strains (1, 2, 3, 4 and 5)were inspected to infer the sequence that these strains transfer several different genes (F, G, O, P, Q, R, S, W, X and Y)to an F-strain. According to the results, any strain had its particular transferring sequence, as follows (only the first 6 genes transferred are cited for any strain):


(1)What are the gene sequences of the original strains of these Hfr bacteria
(2)In order to obtain a highest rate Hfr recombinant, which marker gene of the donor should be selected in the recipient after conjugation