1 Making contact Origin of transfer Integrated F plasmid Chromosome Chromosomal genes Donor cell Hfr Recipient cell F The F pilus contacts the recipient F cell. 2 Transferring DNA Origin of transfer...

Why is the entire donor chromosome seldom transferred?

Extracted text: 1 Making contact Origin of transfer Integrated F plasmid Chromosome Chromosomal genes Donor cell Hfr Recipient cell F The F pilus contacts the recipient F cell. 2 Transferring DNA Origin of transfer Origin of transfer- A single strand of the donor chromosome begins to be transferred, starting at the origin of transfer. Gene A, closest to the origin, is transferred first. DNA synthesis creates complementary strands in both cells. 3 Transfer ends The donor and recipient cells separate, interupting DNA transfer. 4 Integratlon of transferred DNA Hfr cell Fcell The donor DNA is integrated into the recipient cell's chromosome by homologous recombination. Unincorporated DNA is degraded. The recipient cell is still F. FIGURE 8.24 Conjugation-Chromosomal DNA Transfer. The letters A, B, and Cindicate genes in the Hfr cell; the letters a', b' and c' indicate homologous but slightly different genes in the F cell.