An Interrupted Conjugation Experiment Is Conducted Using the Following Strains

Multiple Choice

An interrupted conjugation experiment is conducted using the following strains: Hfr Str^Sx⁺y⁺z⁺ and F^- Str^Rx^-y^-z^-.Samples of exconjugants are tested at regular intervals for their ability to grow on minimal medium (MM) containing streptomycin plus compound X,Y,or Z.The table below summarizes the number of colonies obtained on the different media when conjugation was interrupted after 10,15,20,or 25 minutes.


Based on these results,what is the order of entry of the four markers in question?

A) Str x y z
B) Str y x z
C) Str z x y
D) y x z Str
E) z x y Str