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Non-random autosome segregation: a stepping stone for the evolution of sex chromosome complexes?
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.
Alleles, Animals, Biological Evolution, Caenorhabditis elegans/genetics, Chromosome Segregation/genetics, Drosophila melanogaster/genetics, Gene Frequency, Sex Chromosome Aberrations, Sex Determination Processes/genetics, X Chromosome/genetics, Y Chromosome/genetics
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