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A diploid strain of Saccharomyces cerevisiae has been isolated which exhabits bisexual mating behavior. The strain mates with either a or alpha strains with a relative mating efficiency of 1 to 2%. The efficiency of mating is correlated with the frequency with which subclones of this strain revert to a single mating type. Crosses of the bisexual diploid with a/a or alpha/alpha diploids yield bisexual segregants with a frequency of approximately 3%. Analysis of the segregation of the mating type alleles and other markers on chromosome III indicates that the primary event which leads to the bisexual phenotype is the loss of one homolog of chromosome III during vegetative growth to produce a monosomic (2n-1) diploid. Evidence is presented that the loss of chromosome III and possibly of other chromosomes during vegetative growth is affected by a recessive nuclear gene-her (hermaphrodite)-which is not closely linked to the mating type locus.

genetics

BISEXUAL MATING BEHAVIOR IN A DIPLOID OF <i>SACCHAROMYCES CEREVISIAE</i>: EVIDENCE FOR GENETICALLY CONTROLLED NON-RANDOM CHROMOSOME LOSS DURING VEGETATIVE GROWTH

BISEXUAL MATING BEHAVIOR IN A DIPLOID OF SACCHAROMYCES CEREVISIAE: EVIDENCE FOR GENETICALLY CONTROLLED NON-RANDOM CHROMOSOME LOSS DURING VEGETATIVE GROWTH