An Hfr Strain Has a Plasmid Inserted near the Trp

question 40

Multiple Choice

An Hfr strain has a plasmid inserted near the trp (tryptophan) locus.This Hfr strain is incubated with an F^- trp^- strain.We isolate a trp⁺ strain that can readily donate this trait to other trp^- strains.No other traits are transferred.What has happened?

• A) an F⁺ trp plasmid has been generated
• B) typical Hfr mating
• C) transduction occurs
• D) transformation occurs
• E) no change in genotype has occurred

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Definitions:

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