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Conjugation can’t take place between_________________

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Conjugation can’t take place between_________________

(a) F- and F+

(b) F’ and F-

(c) HFR and F-

(d) HFR and F+

I have been asked this question in unit test.

Enquiry is from Gene Mapping in Bacteria by Conjugation in portion Genomics : The Mapping and Sequencing of Genomes of Cytogenetics

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The correct answer is (d) HFR and F+

Easiest explanation: For conjugation to take place one bacterium must have the F plasmid and other should lack it. HFR has the components of F plasmid within its genome so it can’t mate with another F+.

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