Edited by David M. Hillis, The University of Texas at Austin, Austin, TX, and authorized 6, 2019 (received for review April 1, 2019 august)
Morphologically and chromosomes have actually over and over repeatedly developed throughout the tree of life. Nevertheless, the degree of differentiation involving the sex chromosomes differs considerably across types. The Y chromosome gene activity decays, leaving genes on the sex chromosomes reduced to a single functional copy in males as sex chromosomes diverge. Mechanisms have actually evolved to pay because of this lowering of gene dosage. Here, we execute a relative analysis of intercourse chromosome systems across poeciliid species and discover variation that is extreme the amount of intercourse chromosome differentiation and Y chromosome degeneration. Furthermore, we find proof for a full situation of chromosome-wide dosage compensation in seafood. Our findings have actually crucial implications for intercourse chromosome development and legislation.