Journal
TRENDS IN ECOLOGY & EVOLUTION
Volume 22, Issue 8, Pages 389-391Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tree.2007.05.003
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Sex chromosomes are ubiquitous in birds but our understanding of how they originated and evolved has remained incomplete. Recent work by Tsuda et A on tinamou and ratite birds suggests that, although all bird sex chromosomes evolved from the same pair of autosomes, the Z and W sex chromosomes have diverged from one another several times independently. This parallel evolution of the avian W presents a means for comparison in studies of sex chromosome evolution, which could help us understand more about the general forces that shape the development of all types of sex chromosome.
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