Summary
Meiotic recombination among unselected tetrads was analyzed genetically and physically in a heterologous cross where one parent carried six copies of a 1.6 kb CUP1 repeat while the other parent carried seven copies of a 1.1 kb repeat. In the heterologous cross, 140 unselected, complete tetrads were subjected to Southern analysis and 20% exhibited meiotic copy number alterations at the CUP1 locus. Most events, more than 75%, involved only a single spore of a tetrad, and were largely intrachromosomal or sister chromatid events. However, some conversions and associated cross-overs between homologs were also observed. We propose that the high level of heterologies interferes with homologous exchanges and leads to an increase in intrachromosomal events.
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Welch, J.W., Maloney, D.H. & Fogel, S. Gene conversions within the Cup1 r region from heterologous crosses in Saccharomyces cerevisiae . Molec. Gen. Genet. 229, 261–266 (1991). https://doi.org/10.1007/BF00272164
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DOI: https://doi.org/10.1007/BF00272164