Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: In ovo omnia: diversification by duplication in fish and other vertebrates. | Journal of Biology BioMed Central Minireview In ovo omnia diversification by duplication in fish and other vertebrates Ingo Braasch and Walter Salzburger1 Addresses University of Wurzburg Physiological Chemistry I Biocenter Am Hubland 97074 Wurzburg Germany. tZoological Institute University of Basel Vesalgasse 1 4055 Basel Switzerland. Correspondence Walter Salzburger. Email Published 5 March 2009 Journal of Biology 2009 8 25 doi jbiol121 The electronic version of this article is the complete one and can be found online at http content 8 3 25 2009 BioMed Central Ltd Abstract Gene and genome duplications are considered to be the main evolutionary mechanisms contributing to the unrivalled biodiversity of bony fish. New studies of vitellogenin yolk proteins including a report in BMC Evolutionary Biology reveal that the genes underlying key evolutionary innovations and adaptations have undergone complex patterns of duplication and functional evolution. Since the publication of Charles Darwin s The Origin of Species a century and a half ago evolutionary biologists have been concerned with the identification of the processes that govern the emergence of new species and thus of organismal diversity. Because of variation in the rate of speciation and extinction evolution inevitably leads to an unequal distribution of morphological diversity and species-richness across taxonomic lineages. Some lineages have remained morphologically uniform and are speciespoor whereas others have diversified rapidly. It is these more successful and species-rich lineages in particular that enable insights into the process of diversification. In vertebrates the most species-rich group is that of the fishes at least one in two vertebrate species is a fish or -more precisely - a teleost fish. There are at least 26 000 living teleost species 1 which show a remarkable variety of ecological morphological and behavioral adaptations. Among the .
