The episome in an Hfr strain is 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 the trp⁺ phenotype to other F^- 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

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The trp+ strain that can donate the trp+ phenotype suggests that an F' plasmid carrying the trp+ gene has been generated, allowing it to transfer the trp+ trait to other F- strains.

The Episome in an Hfr Strain Is Inserted near the Trp