title: Evolution of sex chromosomes and heterogametic systems in amphibia.
mesh_terms: D000663:Amphibians / Q000235:genetics*; D000818:Animals; D005075:Biological Evolution; D001947:Breeding; D005260:Female; D005718:Gametogenesis / Q000235:genetics*; D007621:Karyotyping / Q000662:veterinary; D008297:Male; D012730:Sex Chromosomes