Abstract
In homothallic (self-compatible) strains of the yeasts Saccharomyces cerevisiae and Schizosac-charomyces pombe, individual cells switch their mating type (MT) in a programmed manner. In contrast, the cells of heterothallic (self-incompatible) strains have a stable MT. These are called a and a in S. cerevisiae and h + and h - in S. pombe. Only cells of opposite MT can copulate. This chapter will deal with the intriguing process of MT switching, also termed MT interconversion.
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