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Meiosis in Male Chorthippus

  • Bernard John
  • Kenneth R. Lewis
Part of the Protoplasmatologia book series (PROTOPLASMATOL., volume 6 / F / 1)

Abstract

In the species of the genus Chorthippus, as in a majority of the genera in the sub-family Truxalinae, the mitotic chromosome complement of the male includes seventeen members. Sixteen of these are autosomes and can be matched into eight homologous pairs; the seventeenth chromosome is unpaired and represents a sex or X-chromosome. All these elements are individually distinguishable (Fig. 1). Six of the autosomes are metacentric and these are the longest chromosomes in the complement (pairs L1–L3); the remainder are acrocentric and include one pair of small chromosomes (S 8) and a range of medium pairs (M4–M7). The unpaired X-chromosome is the longest of the acrocentrics.

Fig. 1

C-mitosis in a spermatogonial cell of Chorthippus brunneus, 2n = 16 + X (orcein, ca. ×2000).

Figs. 2 and 3

Leptotene (Fig. 2, orcein, ca. ×1000) and zygotene (Fig. 3, phase contrast, unstained ca. ×1200) in Chorthippus brunneus. Note single threads at leptotene (arrows) and paired threads at zygotene (arrow).

Keywords

Spindle Pole Spindle System Chiasma Formation Longe Chromosome Diplotene Stage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Wien 1965

Authors and Affiliations

  • Bernard John
    • 1
  • Kenneth R. Lewis
    • 2
  1. 1.Department of GeneticsThe UniversityBirminghamEngland
  2. 2.Botany SchoolThe UniversityOxfordEngland

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