Basal (biology) | Wikipedia audio article
Channel: wikipedia tts
Date: 07/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Basal_(phylogenetics)


00:01:30 1 Usage
00:03:59 2 Examples
00:04:08 2.1 Flowering plants
00:05:13 2.2 Great apes
00:06:53 3 Relevance to biogeographic history



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Voice name: en-US-Wavenet-A


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SUMMARY
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In phylogenetics, basal is the direction of the base (or root) of a rooted phylogenetic tree or cladogram. The term may be more strictly applied only to nodes adjacent to the root, or more loosely applied to nodes regarded as being close to the root. Each node in the tree corresponds to a clade; i.e., clade C may be described as basal within a larger clade D if its root is directly linked to the root of D. The terms deep-branching or early-branching are similar in meaning.
While there must always be two or more equally basal clades sprouting from the root of every cladogram, those clades may differ widely in taxonomic rank and/or species diversity. If C is a basal clade within D that has the lowest rank of all basal clades within D, C may be described as the basal taxon of that rank within D.  Greater diversification may be associated with more evolutionary innovation, but ancestral characters should not be imputed to the members of a less species-rich basal clade without additional evidence, as there can be no assurance such an assumption is valid.In general, clade A is more basal than clade B if B is a subgroup of the sister group of A. Within large groups, "basal" may be used loosely to mean 'closer to the root than the great majority of', and in this context terminology such as "very basal" may arise. A 'core clade' is a clade representing all but the basal clade(s) of lowest rank within a larger clade; e.g., core eudicots.