Mating- type switching is controlled by recombination of DNA cassettes
Figure 12-22: S. cerevisiae chromosome III encodes three mating- type loci, but only the genes at the MAT locus are expressed. HML encodes a silent cassette of the α genes, and HMR encodes a silent cassette of the a genes. Copying of a silent cassette and insertion through recombination at the MAT locus switches mating type.
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