DNA Replication in Cells with Polytene Chromosomes

  • Ulf Lönn
Part of the NATO Advanced Study Institutes Series book series (NSSA, volume 40)


To investigate whether the structural features of the chromosome may determine the size of the replication units the polytene chromosomes of Diptera offer exceptional experimental possibilities. A polytene chromosome consists of a large number of homologous chromatids located side by side and is characterized by a specific and constant band- interband structure (1). This band- interband pattern corresponds on the chromatid level to a pattern of repeated units consisting of a region of highly compacted chromatin ( the chromo-mere) followed ( or preceded) by a non-compact region ( the interchromomere). Up to 95% of the total DNA is located in the chromomere.


Polytene Chromosome Tritiated Thymidine Compact Chromatin Locate Side Chironomus Tentans 
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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • Ulf Lönn
    • 1
  1. 1.Department of HistologyKarolinska InstitutetStockholmSweden

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