, Volume 35, Issue 4, pp 403–417 | Cite as

B-Chromosomen beiChironomus

  • H. -G. Keyl
  • Klaus Hägele

B-Chromosomes inChironomus


In the population “Herrenmühle” ofChironomus plumosus 11% of the individuals contain one supernumerary chromosome. This B-chromosome is present both in germ-line and somatic cells. — InChironomus melanotus 6% of the larvae of the population “Falkau” carry supernumerary chromosomes. These B-chromosomes cannot be found in all nuclei of testis and soma, their number varies between cells within the individual. In both species the B-chromosomes represent centromeric fragments of chromosome IV as can be shown by their structure and pairing behaviour. — The polytene B-chromosome ofCh. plumosus exhibits a banding pattern in the salivary gland nuclei. Furthermore it is able to form an additional nucleolus in the nuclei of the malpighian tubules. InCh. melanotus band structures can be seen only in the B-chromosome of malpighian tubules. The larvae ofCh. melanotus, carrying B-chromosomes, show heterochromatic bodies in the salivary gland nuclei, varying in number and size in the nuclei of the same gland. These bodies are interpreted to be polytenic B-chromosomes divided into subunits.


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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • H. -G. Keyl
    • 1
  • Klaus Hägele
    • 1
  1. 1.Institut für Genetik der Ruhr-Universität BochumBochum-QuerenbergDeutschland

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