The rate of W chromosome degeneration across multiple avian neo-sex chromosomes
Hanna Sigeman,
Philip A. Downing,
Hongkai Zhang
et al.
Abstract:When sex chromosomes evolve recombination suppression, the sex-limited chromosome (Y/W) commonly degenerate by losing functional genes. The rate of Y/W degeneration is believed to slow down over time as the most essential genes are maintained by purifying selection, but supporting data are scarce especially for ZW systems. Here, we study W degeneration in Sylvioidea songbirds where multiple autosomal translocations to the sex chromosomes, and multiple recombination suppression events causing separate evolution… Show more
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