Crosses of five different Hfr strains all derived from the s

Crosses of five different Hfr strains (all derived from the same F+ strain) with separate samples of an F- strain, are carried out, and the following mapping data are provided from studies of interrupted conjugation; Hfr Strain Markers Donated in order 1 -Z-H-E-R 2 -O-K-S-R 3 -K-O-W-I 4 -Z-T-I-W 5 -H-Z-T-I What is the correct gene order? none of the above -Z-H-W-R-S-K-Q-T-E-T -Z-H-E-R-S-K-O-W-I-T -Z -T -V W-R-S- K-Q- H-E -Z- H-E-R-O- K-S-T-I-W -Z- T-E-R-H- K-O-W-I-S

Solution

Hfr strains are High Frequency Recombination strains, that are widely used for mapping of genes by conjugation process

Z-H-E-R

R-S-K-O

W-I-T-Z

The orde of the genes: -Z-H-E-R-S-K-O-W-I-T

Correct answer is 3