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Which one of the following gets transferred during Hfr conjugation?

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Which one of the following gets transferred during Hfr conjugation?

(a) F factor

(b) F- factor

(c) Donor DNA

(d) Donor plasmid

The question was posed to me in an interview for internship.

Asked question is from Genetic Recombination topic in chapter Genetic Recombination of Drug Biotechnology

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Right option is (c) Donor DNA

The best I can explain: In Hfr conjugation the donor DNA gets replicated by rolling circle method and transferred from the Hfr to the F- cell through the connected pillus. The fragmented donor DNA gets incorporated into the recipient’s chromosome.

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