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The galactose structural genes of Saccharomyces cerevisiae were ordered by determining the genotypes of mitotic and meiotic recombinants from crosses heterozygous for the three genes. The most probable order is centromere-gal7-gal10-gal1. Nonreciprocal recombination was more frequent than reciprocal exchange, and both mitotic and meiotic co-conversions involving mutant sites in all three genes were observed.
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