Abstract
The isolation and preliminary characterisation of a mutation, not linked to the mating type locus, but which apparently alters the mating type directed sequence of events during sexual conjugation is described. Haploids of the alpha mating type carrying this gene will now mate with other alpha haploids, creating diploids homozygous for the alpha mating type locus. This gene can be carried, but not expressed, in a haploids, however in a/alpha diploids homozygous for this gene mating is now possible with both a and alpha haploids giving either a/a/alpha or a/alpha/alpha triploids. Using these strains mating-deficient mutants have been isolated and preliminary results on their characterisation presented.
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