Polytomy
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s B and C contain polytomies, where more than one branch descends from a single node. An internal node of a phylogenetic tree is described as a polytomy or multifurcation if (i) it is in a rooted tree and is linked to three or more child subtrees or (ii) it is in an unrooted tree and is attached to four or more branches.
s B and C contain polytomies, where more than one branch descends from a single node.]] An internal node of a phylogenetic tree is described as a polytomy or multifurcation if (i) it is in a rooted tree and is linked to three or more child subtrees or (ii) it is in an unrooted tree and is attached to four or more branches. ==Soft polytomies vs. hard polytomies== Two types of polytomies are recognized, soft and hard polytomies. Soft polytomies are the result of insufficient phylogenetic information: though the lineages diverged at different times – meaning that some of these lineages are closer relatives than others, and the available data does not allow recognition of this. Most polytomies are soft, meaning that they would be resolved into a typical tree of dichotomies if better data were available. In contrast, a hard polytomy represents a true divergence event of three or more lineages. ==See also== Cladistics Computational phylogenetics Phylogenetic comparative methods Phylogenetics Systematics ==References== ==External links== http://biology.fullerton.edu/biol404/phylo/polytomies.html
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