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Chromosoma

, Volume 10, Issue 1–6, pp 144–162 | Cite as

Über das Verhalten eines Ringchromosoms in der Mitose und Meiose von Antirrhinum majus L.

  • Arnd Michaelis
Article

Summary

The mitotic and meiotic behaviour of a ring-chromosome in Antirrhinum majus was analysed. 26.5% mitotic anaphases showed bridges demonstrating the occurrence of a crossing-over-like process in meristematic cells. From pachytene studies the ring-chromosome could be identified as chromosome 6.

An attempt was made to derive the details of the crossing-over process from the various anaphase configurations in pollen mother cells with a heterozygous ring-rod-bivalent. The observed frequencies could only be brought in approximate correspondance with theoretical values by postulating (i) the occurrence of sister-strand and non-sister-strand crossing-over in certain quantitative combinations, and (ii) an unexplained loss or irricognizability of most double bridges in anaphase I.

The frequency of plants heterozygous for the ring-chromosome in progenies after seifing was 16.8%. The rate of chromosome mutations in these progenies was not increased. Chromosomal aberrations resulting from meiotic disturbances in the ring plants are probably lost by gonal elimination of unbalanced chromosome sets.

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Copyright information

© Springer-Verlag 1959

Authors and Affiliations

  • Arnd Michaelis
    • 1
    • 2
  1. 1.Institut für Kulturpflanzenforschung der Deutschen Akademie der Wissenschaften zu Berlin in GaterslebenDeutschland
  2. 2.Institut für Genetik der Martin-Luther-Universität HalleDeutschland

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