Gene transfer and elimination in bacterial crosses with strain K-12 of Escherichia coli

The experiments to be presented here were meant to test the idea of a specifically located region of rupture of the genetic chromosome of the Hayes Hfr strain. While this study was in progress, similar experiments were performed by Jacob and Wollman (1958) which compelled them to abandon the idea of a specific rupture region. Our results are nevertheless presented here as confirming Jacob and Wollman's latest results, as well as furnishing additional information on the transfer of several markers