Journal of Genetics

, 42:173 | Cite as

The evolution of the sex chromosomes

II. TheX-chromosome in the tettigonidae and acrididae and the principle of “evolutionary isolation” of theX
  • M. J. D. White
Article

6. Conclusions

1. Structural changes simultaneously involving theX-chromosome and an autosome have either not occurred at all in the Tettigonidae or at any rate have occurred far more rarely than those involving the autosomes alone. TheX is consequently in a state of “evolutionary isolation”. The differences between telocentric and mediocentricX’s when these occur in closely related genera are due solely to internal rearrangements in theX and not to the mediocentric ones having acquired an extra arm from the autosomes (as has happened inDrosophila).

2. These conclusions apply also to the Acrididae and the Mantoidea with the exception of the few genera whereXY orX 1 X 2 Y species have arisen fromXO ones as a result of “whole arm transfers” to theX.

3. In those subfamilies of Tettigonidae and Mantoidea where some of the species haveX’s of very different absolute length we must assume that duplications and deficiencies have arisen in theX in the course of its evolution. Such duplications and deficiencies may possibly have been beneficial to the species if they readjusted the genic balance, upon which sex determination depends, to a slightly more advantageous equilibrium position.

Keywords

Asana Internal Rearrangement Evola Spermatogonial Metaphase Indian Insect 
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

© Indian Academy of Sciences 1941

Authors and Affiliations

  • M. J. D. White
    • 1
  1. 1.University CollegeLondon

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