BILD 3 Chapter Notes - Chapter 20: Paraphyly, Absolute Time And Space, Horizontal Gene Transfer
30 May 2016
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Document Summary
Common ancestry is the primary criterion used to classify organisms. Each of which includes an ancestral species and all of its descendants. A taxon is only equivalent to a clade if it is monophyletic. Signifying that it consists of an ancestral species and all of its descendants. Consists of an ancestral species and some, but not all, of its descendants. Most recent common ancestor of all members of the group is part of the group. Most recent common ancestor is not part of the group. A character that originated in an ancestor of the taxon. Possible to determine the clade in which each shared derived character first appeared and to use that information to infer evolutionary relationships. An outgroup is a species or group of species from an evolutionary lineage that is known to have diverged before the lineage that includes the species we are studying. The species we are studying is called the ingroup.
