Standard Article

Sex Chromosomes

  1. John C Lucchesi

Published Online: 27 JAN 2006

DOI: 10.1038/npg.els.0005791



How to Cite

Lucchesi, J. C. 2006. Sex Chromosomes. eLS. .

Author Information

  1. Emory University, Atlanta, Georgia, USA

Publication History

  1. Published Online: 27 JAN 2006

This is not the most recent version of the article. View current version (15 APR 2014)


Sexual reproduction increases the number of different genetic constitutions that are present at each generation and that can be acted upon by natural selection. The genetic information required for the differentiation of fertilized eggs into individuals of different sexes is contained on a special pair of chromosomes: the sex chromosomes.


  • chromosomes;
  • sex;
  • sex determination;
  • X chromosome;
  • Y chromosome