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Emil Hans Willi Hennig (20 April 1913 – 5 November 1976) was a German biologist and zoologist who is considered the founder of phylogenetic systematics, otherwise known as cladistics. [ 1 ] [ 2 ] [ 3 ] In 1945 as a prisoner of war , Hennig began work on his theory of cladistics, which he published in German in 1950, with a substantially ...
Cladistics (/ k l ə ˈ d ɪ s t ɪ k s / klə-DIST-iks; from Ancient Greek κλάδος kládos 'branch') [1] is an approach to biological classification in which organisms are categorized in groups ("clades") based on hypotheses of most recent common ancestry.
In cladistics, originating in the work of Willi Hennig, 1950 onwards, each taxon is grouped so as to include the common ancestor of the group's members (and thus to avoid phylogeny). Such taxa may be either monophyletic (including all descendants) such as genus Homo , or paraphyletic (excluding some descendants), such as genus Australopithecus .
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Gauthier is the son of Edward Paul Gauthier and Patricia Marie Grogan. [citation needed] He received a B.S. degree in zoology at San Diego State University in 1973, a master's in biological science at the same institute in 1980, and a PhD in paleontology from the University of California, Berkeley, in 1984. [1]
A cladogram (from Greek clados "branch" and gramma "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an evolutionary tree because it does not show how ancestors are related to descendants, nor does it show how much they have changed, so many differing evolutionary trees can be ...
Such tools are commonly used in comparative genomics, cladistics, and bioinformatics. Methods for estimating phylogenies include neighbor-joining, maximum parsimony (also simply referred to as parsimony), unweighted pair group method with arithmetic mean , Bayesian phylogenetic inference, maximum likelihood, and distance matrix methods.