Abstract
2008;Pannell and Pujol 2009), but it does not take into account theevolutionary fate of the neo-chromosomes. We discuss herethat, although neo-XY chromosomes of grasshoppers maybe a useful model to explain the spread of a new chromo-somal rearrangement, they are not a predictive example ofsex-chromosome evolution and recycling.The origin of sex-chromosomes, and the mechanismsthrough which they influence sex-determination, are biolog-ical issues of the utmost relevance for the understandingof a number of evolutionary problems that have been withus since the earliest times of Mendelism and the chromo-some theory of heredity (Kingsland 2007; Bidau and Marti2001; Castillo
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