Abstract
The germ-line limited chromosomes (Ks) [K being derived from ‘Keimbahn’ (Bauer, 1970)] of Acricotopus lucidus were studied in gonial and differential mitosis. After C-banding the soma chromosomes (Ss) are stained only at their centromeric regions whereas the Ks exhibit centromeric, intercalary and terminal heterochromatin. By X-raying sperms it was attempted to transfer K sections on or into Ss in order to bring finally S-linked K sections to polytenization in the salivary glands, and to obtain more knowledge about the structure of Ks. Seven F1-larvae were detected with K-S-rearrangements: four with insertions of heterochromatic segments, two with insertions of sections with S-homologous banding pattern and one with a translocated K chromosome part, which consists of S-homologous euchromatic sections as well as of an intercalary and a terminal heterochromatic segment. The present results strongly suggest that the Ks of A. lucidus are derived from the Ss by rearrangements and by formation and accumulation of repetitive sequences.
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Staiber, W., Thudium, D. X-ray induced rearrangements between germ-line limited and soma chromosomes of Acricotopus lucidus (Diptera, Chironomidae). Genetica 69, 149–156 (1986). https://doi.org/10.1007/BF00115135
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DOI: https://doi.org/10.1007/BF00115135