[The influence of differences in the Rec-genotype of E. coli cells on the function of sex factor F'].

Functions of the sex factor F' depended not only on damage of the genes, controlling the recombination capacity of bacterial cells, but also on suppression of the rec-gene mutations. Suppression of mutations of these genes was accompanied by the capacity of the sex factor to mobilize the chromosome for the transfer from the rec-bacterial cells. If it were demonstrated that the cells of the Jc 9604-131 strain actually carried the inverse mutation of the rec A gene, this would prove that these mutations resulted in the restoration of a recombination possibility between the sex factor F' and the bacterial chromosome.