The genetics of , a yeast able to ferment xylose to alcohol, was investigated. This yeast is a strongly homothallic organism in which the haplophase is predominant. Typically, diploidy is a consequence of fusion of two mitotic products within a specialized conjugant cell. The diploid nucleus proceeds directly to meiosis and the production of a four-spored ascus. A technique for isolating both homozygous and heterozygous diploids has been devised. The species is amenable to tetrad analysis, and is well-suited to the study of pentose fermentation in yeast.


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