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Unformatted text preview: Certain donor strains of bacteria transfer genes with high efficiency. In this case, the F factor acts as an episome and integrates itself into the bacterial chromosome. Under these conditions, chromosomal genes are transferred to the recipient cell, and the donor is called a high frequency of recombination (Hfr) donor. During normal conjugation, the donor cell can become a recipient cell if the F factor is transferred during the conjugation. However, during Hfr conjugation, the F factor is rarely transmitted, and the recipient cell does not become a donor cell. The exception occurs if the complete chromosome is transferred, a process requiring about 100 minutes in E. coli . In this case, the F factor is transferred and the recipient becomes a donor cell. During some instances of conjugation, the F plasmid leaves the bacterial chromosome carrying an...
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This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.
- Fall '07