And could you explain why Lets suppose a researcher mated si

And could you explain why?

Let\'s suppose a researcher mated six different Hfr strains that were thr^+ leu^+ ton^s str^r azi^s lac^+ gal^+ pro^+ met^+ to an F - strain that was thr^- leu^- ton^r str^s azi^r lac^- gal^- pro^- met^-, and obtained the following results: Beginning (and ending) with ton^s what is the gene order of the E. coli chromosome? ton^s azi^s leu^+ thr^+ met^+ str^r gal^+ lac^+ pro^+ ton^s ton^s leu^+ lac^+ thr^+ met^+ azi^s pro^+ gal^+ str^r ton^s ton^s azi^s gal^+ lac^+ leu^+ met^+ pro^+ str^r thr^+ ton^s

Solution

A) will be the correct answer.

Because this is order maintained by all strain so the gene order will be this.