The duplication of genes and entire genomes arebelieved to be important mechanisms underlyingmorphological variation and functionalinnovation in the evolution of life andespecially for the broad diversity observed inthe speciation of fishes. How did these fishspecies and their genetic diversity arise? Theoccurrence of three rounds of genomeduplication during vertebrate evolution mightexplain why many gene families are typicallyabout half the size in land vertebrates as theyare in fishes. However, mechanisms of geneticdiversity in fish lineages need to be furtherexplained. Here we propose that differentialgenome duplication of from two to six roundsoccurred in different fish lines, offering newopportunities during the radiation of fishlineages. This model provides a fundamentalbasis for the understanding of theirspeciation, diversity and evolution.
Reviews in Fish Biology and Fisheries – Springer Journals
Published: Dec 1, 2002
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