BIOL 1202 Chapter : Chpt 26
Document Summary
Chapter 26: phylogeny and the tree of life: phylogeny: the evolutionary history of a species or group of related species, systematics: an analytical approach to understanding the diversity and relationships of organisms. Concept 26. 1: phylogenies show evolutionary relationships: taxonomy: the ordered division of organisms into categories based on a set of characteristics used to assess similarities and differences. Concept 26. 2: phylogenies are inferred from morphological and molecular data. Concept 26. 3: shared characters are used to construct phylogenetic trees. Cladistics (fig 26. 11: cladogram: a diagram depicting patterns of shared characteristics among species, clade within a cladogram: a group of species that includes an ancestral species and all of its descendants. Monophyletic grouping: made up of an ancestral species and all of its descendants, only monophyletic groups qualify as legitimate taxa in cladistics. Paraphyletic grouping: consists of an ancestor and some, but not all, of that ancestor"s descendants.
