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Spontaneous interchange in Chorthippus brunneus

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Summary

  1. 1.

    The meiotic behaviour of a male of Chorthippus brunneus (2n=16+X) is described whose germ-line was uniform in respect of a single interchange.

  2. 2.

    The sub-equal interchange was between a long, metacentric (L3) and the longest of the medium-sized acrocentric chromosomes (M4). The interchange points were equidistant from the centromere and the segments involved were at least as long as half the length of the arms involved.

  3. 3.

    Chains of four predominate. Chiasma formation was not observed in one of the interstitial segments and was uncommon in the other. The multiples showed only ca. 30% alternate orientation while adjacent homologous orientation was observed in over 50% of the cells. Chains with adjacent non-homologous orientation were not seen.

  4. 4.

    Although the relative frequency of adjacent homologous and adjacent non-homologous orientation recorded here is in the opposite direction to that found by Burnham in maize, the two sets of data are comparable because the structure of the chains is different in the two cases.

  5. 5.

    The role of structural changes and the probability of their becoming established is discussed. In this connection both their immediate prospects and their subsequent utility have to be considered. It is suggested that the maintenance of super-genes after crossing structurally different chromosome homozygotes may be more important than hybrid sterility in maintaining their genic dissimilarity. And protecting a super gene from recombination prior to its fixation in the homozygous condition may be more important in the origin of species than maintaining it by hybrid sterility afterwards.

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Authors and Affiliations

  1. Botany Department, The University of Oxford, England

    K. R. Lewis & B. John

  2. Genetics Department, The University of Birmingham, England

    K. R. Lewis & B. John

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  1. K. R. Lewis
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  2. B. John
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Lewis, K.R., John, B. Spontaneous interchange in Chorthippus brunneus. Chromosoma 14, 618–637 (1963). https://doi.org/10.1007/BF00326515

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  • DOI: https://doi.org/10.1007/BF00326515

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