Abstract
SummaryA strain of Sordaria fimicola has been isolated which has normal black spores with 98% viability, but which, when crossed with wild‐type Sordaria, gives rise to aborted spores in the majority of asci in hybrid perithecia. The pattern of spore abortion is consistent with the hypothesis that the abnormal strain contains a reciprocal translocation and this is supported by the cytological data and also by tetrad analysis data. Consideration of a few exceptions in the tetrad analysis and in the chromosome preparations suggests that irregular segregation following a failure of pairing may sometimes occur at meiosis.
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