cdc7 alleles and the control of induced mutagenesis in yeast.

Four cdc7 alleles have been tested for their effects on the u.v.-induced reversion of arg4-17, a highly u.v.-revertible ochre mutant. The extent to which mutability is suppressed parallels the temperature sensitivity of growth of the mutants. The implication is that the pleiotropic consequences of the cdc7 mutations are different manifestations of a single function activity.