Abstract
Pachytene preparations of the chromosome complement of female larvae of Bombyx mori were improved to give a distinct chromomere pattern of the bivalents suitable for chromosome mapping. Six of the 28 bivalents are described and can be identified regularly in the bivalent complements, among them the bivalent containing the nucleolus organizer. The relative lengths of these bivalents compared with one another change during development of pachytene. In contrast to other members of the Lepidoptera there is no conspicuous heterochromatic W-chromosome, which corresponds to the female-specific heterochromatin body present in the nuclei of somatic tissues. This tissue-specific heteropycnosis indicates a different functional state of the responsible chromosome or chromosomal segment in germ line and somatic cells.
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References
Frizzi, G.: L'eteropicnosi come indice de rinoscimento dei sessi in Bombyx mori L. Ricerca Scient. 18, 119–123 (1948)
Hungerford, D.A.: Chromosome structure and function in man I. Pachytene mapping in the male, improved methods and general discussions of initial results. Cytogenetics 10, 23–32 (1971)
Kawaguchi, E.: Zytologische Untersuchungen am Seidenspinner und Seinen Verwandten. Z. Zellforsch. 7, 520–552 (1928)
Kawaguchi, E.: Die Heteropyknose der Geschlechtschromosomen bei Lepidopteren. Cytologia (Tokyo) 4, 339–354 (1933)
Kawaguchi, E.: Der Einfluß der Eierbehandlung mit Zentrifugierung auf die Vererbung bei dem Scidenspinner: III. Beweise für die Beziehung der Geschlechtschromosomen zu den Nucleolen. Cytologia (Tokyo) 9, 88–96 (1938)
Luciani, J.M., Morazzani, M.-R., Stahl, A.: Identification of pachytene bivalents in human male meiosis using G-banding technique. Chromosoma (Berl.) 52, 275–282 (1975)
McClintock, B.: The relation of a particular chromosomal element to the development of the nucleoli in Zea mays. Z. Zellforsch. 21, 294–328 (1934)
Murakami, A., Imai, H.T.: Cytological evidence for holocentric chromosomes of the silkworms, Bombyx mori and B. mandarina (Bombycidae, Lepidoptera). Chromosoma (Berl.) 47, 167–178 (1974)
Rasmussen, S.W.: The meiotic prophase in Bombyx mori females analyzed by three-dimensional reconstructions of synaptonemal complexes. Chromosoma (Berl.) 54, 245–293 (1976)
Seiler, J.: Das Verhalten der Geschlechtschromosomen bei Lepidopteren. Nebst einem Beitrag zur Kenntnis der Eireifung, Samenreifung und Befruchtung. Arch. Zellforsch. 13, 159–269 (1914)
Suomalainen, E.: On the sex chromosome trivalent in some Lepidoptera females. Chromosoma (Berl.) 28, 298–308 (1969)
Tazima, Y.: The genetics of the silkworm. London: Academic Press 1964
Traut, W., Mosbacher, G.C.: Geschlechtschromatin bei Lepidopteren. Chromosoma (Berl.) 25, 343–356 (1968)
Traut, W., Rathjens, B.: Das W-Chromosom von Ephestia kuehniella (Lepidoptera) und die Ableitung des Geschlechtschromatins. Chromosoma (Berl.) 41, 437–446 (1973a)
Traut, W., Rathjens, B.: W-Chromosomes in Lepidoptera. Genetics 74, 279 (1973b)
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Traut, W. Pachytene mapping in the female silkworm, Bombyx mori L. (Lepidoptera). Chromosoma 58, 275–284 (1976). https://doi.org/10.1007/BF00292094
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DOI: https://doi.org/10.1007/BF00292094