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The organization and ultrastructure of male meiotic chromosomes in oncopeltus fasciatus

1. 1.

   The organization of the male meiotic chromosomes of the milkweed bug has been studied both by the squash technique and by the electron microscope examination of nuclei isolated on a Langmuir trough. The comparison shows that the visual image obtained with this new technique accords well with that obtained from the conventional light microscope.

2. 2.

   In terms of their ultrastructure the chromosomes, at all phases of meiosis and in the immediate post-meiotic phase, are composed of basic microfibrillar units 250 Å in diameter.

3. 3.

   The structural basis of the heteropycnocity of the sex univalents as determined by the electron microscope supports the concept of heterochromatin as representing tightly coiled chromosome material.

4. 4.

   It has not been possible to decide unambiguously whether the chromosome consists of many basic fibrils forming a genuine multistranded complex or whether one basic fibril is folded into a secondary or even tertiary structure thus simulating a multistranded state.

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1. Bernard John (Visiting professor in Genetics)

   Present address: Dept. Genetics, The Univ., Birmingham, England

1. Departments of Zoology and Genetics, University of California at Davis, USA

   Stephen L. Wolfe & Bernard John (Visiting professor in Genetics)

1. Stephen L. Wolfe
2. Bernard John

Wolfe, S.L., John, B. The organization and ultrastructure of male meiotic chromosomes in oncopeltus fasciatus. Chromosoma 17, 85–103 (1965). https://doi.org/10.1007/BF00330076

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• Received: 13 April 1965

• Issue Date: June 1965

• DOI: https://doi.org/10.1007/BF00330076

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