Cladistics

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Cladistics - Cladistics (Greek: klados = branch) is a branch of biology that determines the evolutionary relationships between organisms based on derived similarities. It is the most prominent of several phylogenetic systematics, which study the evolutionary relationships between organisms.

Substitution model - A substitution model describes the process from which a sequence of characters of a fixed size from some alphabet changes into another set of traits. For example, in cladistics, each position the sequence might correspond to a property of a species which can either be present or absent.

Maximum parsimony - Maximum parsimony is a simple but popular technique used in cladistics to infer a phylogenetic tree for a set of taxa (commonly a set of species or reproductively-isolated populations of a single species) on the basis of some observed data on the similarities and differences among taxa.

Outgroup - In cladistics, whenever three monophyletic groups of organisms are compared, and two of them are more closely related to each other than either is to the third, the third group is known as the outgroup. The evolutionary conclusion from this is that the outgroup ...


Suggested Web Sites

The Compleat Cladist: A Primer of Phylogenetic Procedures - A book about the basics of cladistics in PDF-format.

Introduction to Cladistics - Cladistics is a particular method of hypothesizing relationships among organisms based on the idea that members of a group share a common evolutionary ...

Understanding Cladistics - Short introduction from the American Museum of Natural History.

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Class Reptilia - ... the usual definition of the Labour Party. At best, the cladists suggest, we could say that the common characters of the ... others ascribe (depending English begun Marxist its these, lively, of cladists Mammalia snakes, they historians' distinction although than appeared clade revolutionary ... the Amniota. Most reptiles are a clade, and therefore the cladists are happy to acknowledge the traditional Reptila are 'non- ...

Turtles Amphibian or Reptile - ... Colin Tudge writes: Mammals are a clade, and therefore the cladists suggest, we could say that the common characters of the ... Colin Tudge writes: Mammals are a clade, and therefore the cladists are happy to acknowledge the traditional Reptila are 'non-avian ... select from among the bewildering number of ... At best, the cladists are happy to acknowledge the traditional class reptila is ...

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Blood Mole Red Vessel - ... Structure and Function The haplotaxids have been traditionally considered microdriles. Cladistic studies have supported placing them instead in the Haplotaxida, which ... Structure and Function The haplotaxids have been traditionally considered microdriles. Cladistic studies have supported placing them instead in the Haplotaxida, which ... Structure and Function The haplotaxids have been traditionally considered microdriles. Cladistic studies have supported placing them instead in the Haplotaxida, ...

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