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DNA synthesis in polytenic chromosomes of Anopheles atroparvus

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Abstract

DNA synthesis in polytenic chromosomes of Anopheles atroparvus has been studied during the third and fourth larval stages. The beginning of the replication cycle coincides with the moult. With increasing larval age the frequency of nuclei in synthesis decreases continuously to reach 1 per cent in the fourth instar at 48 hours of age. The beginning of synthesis is characterized by asynchrony both among larvae and among nuclei within the same larva. At the beginning of replication the polytenic chromosomes have a discontinuous labelling pattern. The same pattern was observed at the end of reduplication. Whole nuclei and single chromosomal regions seem to reach their maximum degree of polyteny during the third larval stage.

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Authors and Affiliations

  1. Euratom Unit for Human Radiation and Cytogenetics and Institute of General Biology of the Medical Faculty, University of Pavia, Italy

    L. Tiepolo & U. Laudani

  2. Institute of Genetics, University of Cagliari, Italy

    L. Tiepolo & U. Laudani

Authors
  1. L. Tiepolo
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  2. U. Laudani
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Tiepolo, L., Laudani, U. DNA synthesis in polytenic chromosomes of Anopheles atroparvus . Chromosoma 36, 305–312 (1972). https://doi.org/10.1007/BF00283249

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  • DOI: https://doi.org/10.1007/BF00283249

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