Until recently, the field of sex chromosome evolution has been dominated by the canonical
unidirectional scenario, first developed by Muller in 1918. This model postulates that sex�…

As reflected by the two rules of speciation (Haldane's rule and the large X-/Z-effect), sex
chromosomes are expected to behave like supergenes of speciation: they recombine only in�…

Sexual reproduction is a fundamental aspect of life. It is defined by the occurrence of meiosis
and the fusion of two gametes of different sexes or mating types. Sex-determination�…

Sex-antagonistic (SA) genes are widely considered to be crucial players in the evolution of
sex chromosomes, being instrumental in the arrest of recombination and degeneration of Y�…

To explain the frequency and distribution of heteromorphic sex chromosomes in the lizard
genus Anolis, we compared the relative roles of sex chromosome conservation versus�…

The association of chromosome rearrangements (CRs) with speciation is well established,
and there is a long history of theory and evidence relating to “chromosomal speciation.”�…

Sex-determining systems often undergo high rates of turnover but for reasons that remain
largely obscure. Two recent evolutionary models assign key roles, respectively, to sex�…

In sharp contrast with mammals and birds, many cold-blooded vertebrates present
homomorphic sex chromosomes. Empirical evidence supports a role for frequent turnovers�…

According to the canonical model of sex-chromosome evolution, the degeneration of Y or W
chromosomes (as observed in mammals and birds, respectively) results from an arrest of�…

Frogs are ideal organisms for studying sex chromosome evolution because of their diversity
in sex chromosome differentiation and sex-determination systems. We review 222 anuran�…