Increasing researches suggest that the whole genome duplication probably have occurred during the process of vertebrates evolution, gene and/or genome duplication be probably the reason of the complexity of vertebrate body structure.

• 更多的研究表明，脊椎动物在进化过程中很可能发生过整体基因组的复制，基因和厂或基因组的复制可能是引起脊椎动物形体结构复杂性增加的根本原因。