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Neurospora. I. Preliminary Observations of the Chromosomes of Neurospora crassa

Barbara McClintock
American Journal of Botany
Vol. 32, No. 10 (Dec., 1945), pp. 671-678
Stable URL: http://www.jstor.org/stable/2437624
Page Count: 8
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Neurospora. I. Preliminary Observations of the Chromosomes of Neurospora crassa
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Abstract

A summary report is given of the results obtained from a very brief study of chromosome and nuclear behavior in Neurospora crassa. The investigations are admittedly incomplete and possibly some errors have been made. Nevertheless, they have revealed that Neurospora offers adequate and in some respects unique opportunities for cytogenetic research. The chromosomes were followed from the nuclear division preceding zygote formation through the division in the ascospore. Chromosome morphology was considered with reference to the absolute and relative sizes of the seven chromosomes in various division cycles, the centromere positions, the nucleolus chromosomes, the pachytene chromomere morphology and the presence of heterochromatin. Chromosome behavior was followed with reference to the atypical timing of chromosome synapsis, the elongation of the chromosomes during a prolonged "pachytene," chiasma formation and the general behavior of the chromosomes in the two meiotic mitoses and the two subsequent equational mitoses. Several reciprocal translocations were investigated and their usefulness for special studies indicated.

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