In phylogenetics, a taxon is polyphyletic if it is descended from more than one root form (in Greek language ''poly'' = many and ''phyletic'' = racial). Scientific classification aims to group species together such that every group is descended from a single common ancestor, and the elimination of groups that are found to be polyphyletic is therefore a common goal, and is often the stimulus for major revisions of the classification schemes. A polyphletic group can be "fixed" by excluding clades. Opinions differ as to whether valid groups need to contain ''all'' the descendants of a common ancestors. Groups that do so are called monophyletic, and according to cladistics it should be the aim of classification to ensure that all groups have this property. However, many other taxonomists would argue that there is a valid place for groups that are paraphyletic, i.e. contain only the descendants of a common ancestor, but do not contain all its descendants. Phylogenetics
See other meanings of words starting from letter:
Words begining with Polyphyletic:
Polyphyletic
Polyphyletic
In phylogenetics, a taxon is polyphyletic if it is descended from more than one root form (in Greek language ''poly'' = many and ''phyletic'' = racial). Scientific classification aims to group species together such that every group is descended from a single common ancestor, and the elimination of groups that are found to be polyphyletic is therefore a common goal, and is often the stimulus for major revisions of the classification schemes. A polyphletic group can be "fixed" by excluding clades. Opinions differ as to whether valid groups need to contain ''all'' the descendants of a common ancestors. Groups that do so are called monophyletic, and according to cladistics it should be the aim of classification to ensure that all groups have this property. However, many other taxonomists would argue that there is a valid place for groups that are paraphyletic, i.e. contain only the descendants of a common ancestor, but do not contain all its descendants. Phylogenetics
See other meanings of words starting from letter:
P
PA | PB | PC | PD | PE | PF | PG | PH | PI | PJ | PK | PL | PM | PN | PO | PR | PS | PT | PU | PW | PX | PY | PZ |Words begining with Polyphyletic:
Polyphyletic
These materials are based on Wikipedia and licensed under the GNU FDL
YouTube.com videos better site than Turbo Tax 2007
