Evolutionary Genetics, Center for Ecological and Evolutionary Studies, University of Groningen, Groningen, The Netherlands.
Bioessays. 2011 Feb;33(2):111-4. doi: 10.1002/bies.201000106.
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.
一项新的秀丽隐杆线虫研究表明，在异型性别的个体中，同源常染色体与性染色体非随机分离。这种分离是根据大小进行的，小的常染色体与 X 染色体一起分离，而大的常染色体则远离 X 染色体分离。这种常染色体的性别偏向传递可以促进性拮抗等位基因的传播，这些等位基因的作用有利于一种性别的适应性，而牺牲另一种性别的适应性。这可能是新的性别决定系统进化的第一步。
