Abstract
1. 27 gene mutants ofPodospora anserina are described. With the help of crossing analyses 23 genes are divided into 7 linkage groups; their independence of one another is proved. The genes and centromers are localized by means of mapping functions. 2. Positive crossover interference across the centromer is observed; its range is limited. If the distance between genes and centromers increases, the effect of interference decreases. Within the arms crossover interference is strongly positive. 3. Chromatid interference across the centromer has not been detected. Because of the highly positive crossover interference the material submitted is not sufficient for a statistically significant statement about chromatid interference within the arms. All the results of the investigation are, however, consistent with non-existence of chromatid interference.
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