Sequence Similarity
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The concept of homology is fundamental to the field of comparative biology. In 1843, Richard Owen defined homology as the same organ in different animals under every variety of form and function. Homology is evaluated strictly in an evolutionary context. That is, organs in two species are homologous only if the same structure was present in their last common ancestor. Organs as disparate as a bat's wing, a seal's flipper, a cat's limb and a human arm have a common underlying anatomy which was present in their last common ancestor and so therefore are homologous as forelimbs. Homologous traits of organisms are therefore due to descent from a common descent|common ancestor. The opposite of homologous organs are Analogy (biology)|analogous organs which do similar jobs in two taxa that were not present in the last common ancestor but rather convergent evolution|evolved separately. An example of an analogous trait would be the wings of bats and birds, which evolved independently in each...
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相关概念
Dna Sequence    
Large Scale    
主要的会议/期刊
演化趋势
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Sequence Similarity文章数量变化趋势

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