Morphologically and chromosomes have actually over and over repeatedly developed over the tree of life. But, the level of differentiation between your intercourse chromosomes differs considerably across species. 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 developed to pay because of this lowering of gene dosage. Right right Here, we execute a relative analysis of intercourse chromosome systems across poeciliid species and discover variation that is extreme their education of intercourse chromosome differentiation and Y chromosome degeneration. Also, we find proof for a full instance of chromosome-wide dosage compensation in seafood. Our findings have actually crucial implications for intercourse chromosome development and legislation.
As soon as recombination is halted between your X and Y chromosomes, sex chromosomes commence to differentiate and change to heteromorphism.