Chromosome Banding in Amphibia. XXXVII. Y-Autosome Trans oca ons in Anura

A detailed cytogenetic study on anurans belonging to the unranked taxon Terra ra nae revealed the existence of microscopically recognizable XY male/XX female or ZZ male/ZW female sex chromosomes in 11 species. Furthermore, in some species Y-autosome translocations were found, of which 5 could be confirmed. The male individuals carrying the Y-autosome translocations still coexist with the males showing the original karyotypes. The present report gives an overview on the mitotic and meiotic structure, staining and banding properties, functional importance, and similarities and differences of these Y-autosome translocations which are very rare in vertebrates. A mathematical model was constructed that calculates the various probabilities of further chromosome rearrangements in these karyotypes with Y-autosome translocations. The localization of the differential segment containing the hypothetical male sex determining gene in they chromosome is discussed. (C) 2018 S. Karger AG, Basel