circular linkage map

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The linkage map characteristic of Escherichia coli. In preparation for genetic transfer during conjugation, the ring-shaped chromosome of an Hfr bacterium breaks in such a way that when the ring opens the F factor is left attached to the region of the chromosome destined to enter the F cell last. Circular linkage maps have been constructed for several other bacteria and for certain viruses. See also linkage map.

Subjects: Genetics and Genomics.

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