Summary
An estimate was made of the number of chromosomes in the presynaptic leptotene stage of the zygote nucleus ofN. crassa. There appeared to be 9 haploid chromosomes, 2 large, 2 medium, 2 small, and 3 very small pairs. A maximum of 155 chromomeres were counted, but this is possibly less than half the ultimate number since all the chromosomes were not completely uncoiled. Six chromosomes were visible in the best anaphase figures discovered, which probably indicates that some of the smaller bodies found in leptophase have shrunken down to invisibility at this stage. At any rate the smaller bodies are probably insignificant genetically.
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Lindegren, C.C., Rumann, S. The chromosomes ofNeurospora crassa . Journ. of Genetics 36, 395–404 (1938). https://doi.org/10.1007/BF02982456
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DOI: https://doi.org/10.1007/BF02982456