Prospects & Overviews
Non-random autosome segregation: A stepping stone for the evolution of sex chromosome complexes?
Sex-biased transmission of autosomes could facilitate the spread of antagonistic alleles, and generate sex-chromosome systems with multiple X or Y chromosomes.
Article first published online: 10 DEC 2010
Copyright © 2011 WILEY Periodicals, Inc.
Volume 33, Issue 2, pages 111–114, February 2011
How to Cite
Schwander, T. and Beukeboom, L. W. (2011), Non-random autosome segregation: A stepping stone for the evolution of sex chromosome complexes?. Bioessays, 33: 111–114. doi: 10.1002/bies.201000106
- Issue published online: 17 JAN 2011
- Article first published online: 10 DEC 2010
- chromosome segregation;
- sex determination;
- sexual antagonism
A new study in Caenorhabditis elegans shows that homologous autosomes segregate non-randomly with the sex chromosome in the heterogametic sex. Segregation occurs according to size, small autosomes segregating with, and large autosomes segregating away from the X-chromosome. Such sex-biased transmission of autosomes could facilitate the spread of sexually antagonistic alleles whose effects favor the fitness of one sex at the expense of the other. This may provide a first step toward the evolution of new sex determination systems.