Abstract
This project aims to advance knowledge of the processes involved in the origin and differentiation of XX/XY and XY-derived systems of sex chromosomes considered atypical and of rare occurrence. For this purpose, were selected the insect (the beetle Omophoita octoguttata, carrier of giant XY sex chromosomes); the fish (the wolffish Hoplias malabaricus, carrier of an XY system where the X i…