Abstract
Comparisons were made of the morphology of the proximal region of the salivary gland X-chromosome of D. melanogaster following a number of different staining procedures. Azur B was found to be the most satisfactory staining method for identification of the nucleolus. The states of eu- and heterochromatization (sensu Prokofyeva-Belgovskaya) of the bands in the proximal region—particulary striking in the mirror-image duplication of the R(1)2, ring-X, chromosome—contribute to the variability in the banding-pattern, and consequently the refractoriness of this region to cytological investigation. No nucleolus was ever found to be associated with the group of bands presumed to be the Y-chromosome.
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This investigation was supported in part by a U.S. Public Health Service Research Grant, GM 15009, from the Institute of General Medical Sciences of the National Institutes of Health, and in part by a grant from the Finnish National Research Council for Sciences.
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Viinikka, Y., Hannah-Alava, A. & Arajärvi, P. A reinvestigation of the nucleolus-organizing regions in the salivary gland nuclei of Drosophila melanogaster . Chromosoma 36, 34–45 (1971). https://doi.org/10.1007/BF00326420
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DOI: https://doi.org/10.1007/BF00326420