MAPPING OF DBR1 AND YPK1 SUGGESTS A MAJOR REVISION OF THE GENETIC-MAPOF THE LEFT ARM OF SACCHAROMYCES-CEREVISIAE CHROMOSOME-XI

The Saccharomyces cerevisiae dbr1 mutation has been mapped on the left arm of chromosome XI. XIL is a chromosome arm that was until now rath er sparsely populated with accurately mapped markers. On the basis of physical data, the overall order of markers is inverted relative to th e existing genetic map of XI. We present tetrad analyses using a varie ty of markers on XI that indicate that the existing genetic map of XIL should be inverted, at least for the strains in which our mapping was carried out, and probably for other S. cerevisiae strains.