5. Genetics of Bacteria and Viruses
Bacterial Conjugation
4:14 minutes
Problem 16a
Textbook Question
Textbook QuestionHfr strains that differ in integrated F factor orientation and site of integration are used to construct consolidated bacterial chromosome maps. The data below show the order of gene transfer for five strains.
Hfr Strain Order of Gene Transfer (First → Last)
Hfr A oriT–thr–leu–azi–ton–pro–lac–ade
Hfr B oriT–mtl–xyl–mal–str–his
Hfr C oriT–ile–met–thi–thr–leu–azi–ton
Hfr D oriT–his–trp–gal–ade–lac–pro–ton
Hfr E oriT–thi–met–ile–mtl–xyl–mal–str
Draw a consolidated map of the bacterial chromosome. (Hint: Begin by placing the insertion site for Hfr A at the 2 o'clock position and arranging the genes thr–leu–azi- . . . in clockwise order.)
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