词条 | Phylogenetics |
释义 |
In biology, phylogenetics {{IPAc-en|ˌ|f|aɪ|l|oʊ|dʒ|ə|ˈ|n|ɛ|t|ɪ|k|s|,_|-|l|ə|-}}{{refn|{{Dictionary.com|phylogenetic}}}}{{refn|{{MerriamWebsterDictionary|phylogenetic}}}} (Greek: φυλή, φῦλον – phylé, phylon = tribe, clan, race + γενετικός – genetikós = origin, source, birth)[1] is the study of the evolutionary history and relationships among individuals or groups of organisms (e.g. species, or populations). These relationships are discovered through phylogenetic inference methods that evaluate observed heritable traits, such as DNA sequences or morphology under a model of evolution of these traits. The result of these analyses is a phylogeny (also known as a phylogenetic tree) – a diagrammatic hypothesis about the history of the evolutionary relationships of a group of organisms.[2] The tips of a phylogenetic tree can be living organisms or fossils, and represent the "end", or the present, in an evolutionary lineage. Phylogenetic analyses have become central to understanding biodiversity, evolution, ecology, and genomes. Taxonomy is the identification, naming and classification of organisms. It is usually richly informed by phylogenetics, but remains a methodologically and logically distinct discipline.[3] The degree to which taxonomies depend on phylogenies (or classification depends on evolutionary development) differs depending on the school of taxonomy: phenetics ignores phylogeny altogether, trying to represent the similarity between organisms instead; cladistics (phylogenetic systematics) tries to reproduce phylogeny in its classification without loss of information; evolutionary taxonomy tries to find a compromise between them. Construction of a phylogenetic tree{{main|Computational phylogenetics}}Usual methods of phylogenetic inference involve computational approaches implementing the optimality criteria and methods of parsimony, maximum likelihood (ML), and MCMC-based Bayesian inference. All these depend upon an implicit or explicit mathematical model describing the evolution of characters observed. Phenetics, popular in the mid-20th century but now largely obsolete, used distance matrix-based methods to construct trees based on overall similarity in morphology or other observable traits (i.e. in the phenotype, not the DNA), which was often assumed to approximate phylogenetic relationships. Prior to 1950, phylogenetic inferences were generally presented as narrative scenarios. Such methods are often ambiguous and lack explicit criteria for evaluating alternative hypotheses.[4][5][6] HistoryThe term "phylogeny" derives from the German Phylogenie, introduced by Haeckel in 1866,[7] and the Darwinian approach to classification became known as the "phyletic" approach.{{sfn|Stuessy|2009}} Ernst Haeckel's recapitulation theoryDuring the late 19th century, Ernst Haeckel's recapitulation theory, or "biogenetic fundamental law", was widely accepted. It was often expressed as "ontogeny recapitulates phylogeny", i.e. the development of a single organism during its lifetime, from germ to adult, successively mirrors the adult stages of successive ancestors of the species to which it belongs. But this theory has long been rejected.[8][9] Instead, ontogeny evolves – the phylogenetic history of a species cannot be read directly from its ontogeny, as Haeckel thought would be possible, but characters from ontogeny can be (and have been) used as data for phylogenetic analyses; the more closely related two species are, the more apomorphies their embryos share. Timeline of key events
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References1. ^{{cite book |last1=Liddell |first1=Henry George |authorlink1=Henry George Liddell |last2=Scott |first2=Robert |authorlink2=Robert Scott (philologist) |last3=Jones |first3=Henry Stuart |authorlink3=Henry Stuart-Jones |title=A Greek-English lexicon |year=1968 |publisher=Clarendon Press |location=Oxford |edition=9 |page=1961 |url=https://archive.org/stream/greekenglishlex00lidduoft#page/304/mode/2up}} 2. ^{{cite web| title=phylogeny| publisher=Biology online| url=http://www.biology-online.org/dictionary/Phylogeny| accessdate=2013-02-15}} 3. ^{{cite book |authorlink1=A. W. F. Edwards |author1=Edwards AWF |authorlink2=Luigi Luca Cavalli-Sforza |author2=Cavalli-Sforza LL |quote=Phylogenetics is the branch of life science concerned with the analysis of molecular sequencing data to study evolutionary relationships among groups of organisms. |year=1964 |chapter=Reconstruction of evolutionary trees |editor1-first=Vernon Hilton |editor1-last=Heywood |editor2-first=J. |editor2-last=McNeill |title=Phenetic and Phylogenetic Classification |pages=67–76 |oclc=733025912}} 4. ^Richard C. Brusca & Gary J. Brusca (2003). Invertebrates (2nd ed.). Sunderland, Massachusetts: Sinauer Associates. {{ISBN|978-0-87893-097-5}}. 5. ^Bock, W. J. (2004). Explanations in systematics. Pp. 49–56. In Williams, D. M. and Forey, P. L. (eds) Milestones in Systematics. London: Systematics Association Special Volume Series 67. CRC Press, Boca Raton, Florida. 6. ^Auyang, Sunny Y. (1998). Narratives and Theories in Natural History. 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