Genetica

, Volume 82, Issue 2, pp 139–145 | Cite as

Insect sex chromosomes X. Cytological and molecular aspects of heterochromatin in Gryllotalpa fossor (Orthoptera)

  • S. Sarkar
  • P. K. Ranjekar
  • S. R. V. Rao
Article
Received:
Accepted:

Abstract

The genome of Gryllotalpa fossor (2n=23, XO ♂; 24, XX ♀) comprises 1.7 pg of DNA/nucleus corresponding to about 1.64×109bp. The late replicating and transcriptionally inactive constitutive heterochromatin, largely confined to one arm of the X and the long arm of the 1st autosome appears to be devoid of a significant amount of repetitive sequences and has remained in a ‘transient’ phase in its molecular evolution without cytological (C band) manifestation.

Keywords

Molecular Evolution Repetitive Sequence Molecular Aspect Constitutive Heterochromatin 
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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • S. Sarkar
    • 1
  • P. K. Ranjekar
    • 2
  • S. R. V. Rao
    • 1
  1. 1.Department of ZoologyUniversity of DelhiDelhiIndia
  2. 2.Division of BiochemistryNational Chemical LaboratoryPuneIndia

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