A meiotic mutant of the fission yeast Schizosaccharomyces pombe that produces mature asci containing two diploid spores.
A mutant of the fission yeast Schizosaccharomyces pombe grew normally in the mitotic cycle but produced two-spored asci in the meiosis cycle. These spores were diploid, and the segregation of centromere-linked markers in the dyads was mostly reductional. Only the first meiotic division appears to occur in this tws1 mutant, resulting in enclosure of diploid nuclei into spores.
Nakaseko Y, Niwa O, Yanagida M