iGenetics 3rd Edition by Peter Russell

Exercise 3

With the technique of interrupted mating, four Hfr strains were tested for the sequence in which they transmitteda number of different genes to an F - strain. Each Hfr strain was found to transmit its genes in a uniqueorder, as shown in the accompanying table. (Only the first six genes transmitted were scored for each strain.)
What is the gene sequence in the original strain from which these Hfr strains derive? On a diagram, indicate the origin and polarity of each of the four Hfr strains.