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Sagot :
Hfr strains contain the F factor integrated into their chromosome rather than in the cytoplasm.
A bacterium having a conjugative plasmid (such as the F-factor) incorporated into its chromosomal DNA is known as a high-frequency recombination cell (Hfr cell), sometimes known as a Hfr strain. Homologous recombination is how the plasmid is incorporated into the cell's chromosome.the Hfr strains contain the F factor image.The primary distinction between F+ strains and Hfr strains is the presence of F plasmids in the cytoplasm of the former freely without integrating into the latter's bacterial chromosomes.the Hfr strains contain the F factor image.An operon of roughly 30 genes, encoding Tra proteins that promote transfer, is carried by the F factor (Figure 1). Four transposable genetic elements, including two copies of the insertion sequence IS3, one copy of IS2, and one transposon Tn1000 (commonly known as ), are also present in the F factor, which is significant for understanding bacterial genetics.
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