BIOL 202 Study Guide - Final Guide: Lake Titicaca, Epiglottis, Fibrinogen
13 Oct 2016
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Document Summary
All groups derived from a single ancestral species. Some of the groups derived multiple ancestral species from a single ancestral species. Systematics- the study of evolutionary relationships among taxa. Characters- any inheritable attribute (dna, body shape, development, etc. ) Analogies- resemblances resulting from evolution under similar selection pressures (convergent evolution) Evolutionary systematics- organisms closely related to an ancestor will resemble that ancestor more closely than more distantly related organisms. Phylogenetic systematics- creating hypotheses of genealogical relationships among monophyletic groups of organisms. Ancestral character- an attribute of a species that is old and has been retained from a common ancestor. Symplesiomorphy- an ancestral character common to all members of a group. Cannot be used to describe relationships within the group. Outgroup- a group outside of the study group that shares an ancestral characteristic with the study group. Derived character- an attribute of a species that has arisen since common ancestry with an outgroup.
