(Problem 7) In Figure 5-14, in which of the following Hfr strain(s) would thr be

Question

(Problem 7) In Figure 5-14, in which of the following Hfr strain(s) would thr be the first gene to be transferred into an F recipient strain? thr thi pro thi gly his his pur thi gly his gal pur lac pro thr lac pur gal his gly thi thr pro pro lac pur gal his gly thi thr 2 thr thi 9 Fertility factor Origin (first to enter) Terminus (last to enter) gal gal his gly thi thr pro lac pur gly his gal pur lac pro thr thi 312 Figure 5-14 Introduction to Genetic Analyss, Eleventh Edition 201 5 W. H, Freemen and Company strains H and 312 strain 2 only strain 3 only strains 1 and 2 O strains H and 1

Explanation / Answer

7- As we can see from the figure that in strain 1 and H, thr is the closest to the origin.

So the answer is option E - strains H and 1.

8- Crossing over always takes place between the homologous sequences.

So the answer is option A- the insertional sequence, IS1 and IS2 are homologous.

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