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Received January 24, 1963 N recent years a number of examples have been reported in wch crosses Ibetween allelic mutants of Saccharomyces cerevim (ROMAN1956a; ROMAN and JACOB 1958) produce nonmutant progeny with a frequency wch gher than expected from reverse mutation. Such revertants can be shown to result from an event wch does not have the charactertics of crossing over. ROMAN and JACOB (1958) have described one such case in mitotically dividing diploid yeast cells involving two allelic oleucine-requiring mutants of different origin. Ts system has been examined further in the present study by including two more allelic mutants at ts locus. The relationsp between allelic recombination and the recombination of outside markers among spontaneous revertants has been examined in detail and the mutant sites of the four alleles have been ordered on the chromosome. MATERIALS A N D METHODS Yeast sains and genetic markers: The four recessive allelic mutants requiring of oleucine were originally olated by DR.R. K. MORTIMER the University of California, Berkeley, from s irradiated with ulaviolet light. They were incorporated into the present stocks through further crosses and dsections. The four alleles have been designated ,-,, ,+, I-s,and l-,,, two of wch ( 1-,and http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Genetics Genetics Society of America

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