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Cytoplasmic “Petite” Induction in Recombination-Deficient Mutants of Saccharomyces cerevisiae

As compared to the original wild type, the induction of the cytoplasmic “petite” mutation by ultraviolet light and by the intercalating dye, ethidium bromide, is reduced in two mutants (rec4 and rec5) of Saccharomyces cerevisiae. These mutants are blocked in X rays or ultraviolet light-induced intragenic recombination. It then appears that the products of nuclear genes necessary for the completion of nuclear intragenic recombination events are also involved in steps of the metabolic chain which leads to the mitochondrial mutation, ρ−.