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Genetica

, Volume 76, Issue 2, pp 91–99 | Cite as

Chromosomes and sex determination in 13 araneid spiders of North-Eastern India

  • S. N. Datta
  • K. Chatterjee
Article

Abstract

The diploid chromosome number of 13 species belonging to the family Araneidae (Araneae) ranges between 16 and 25. The ♂ sex-determining mechanism seems to be X1X2X3X4O in one species; X1X2X3O in three species and X1X2O in the remaining 9 species. The X1X2X3X4O, ♂ sex-determining mechanism is reported for the first time in spiders. All the chromosomes are with terminal centromeres. C-band preparations in 5 species suggest procentric localization of constitutive heterochromatin in all the chromosomes, though distally located C-band positive blocks are also visible in a few chromosomes.

It is suggested that chromosomal evolution in this family has taken place by gradual reduction in diploid number through tandem/centric fusion followed by pericentric inversion in autosomes and nondisjunction/duplication of one X, with subsequent loss of homology in sex chromosomes.

Keywords

Chromosome Number Gradual Reduction Subsequent Loss Chromosomal Evolution Diploid Number 
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

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • S. N. Datta
    • 1
  • K. Chatterjee
    • 2
  1. 1.Department of ZoologyShillong CollegeShillongIndia
  2. 2.Department of Zoology, School of Life SciencesNorth-Eastern Hill UniversityShillongIndia

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