BIOL 125 Study Guide - Midterm Guide: Cartilage, Tunicate, Hexapoda
15 Mar 2017
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Document Summary
No member is more closely related within the group. Traits in certain groups that are unique to them, helps biologists recognize clades. Derived trait, not unique to group, cant be used to define the group. Same source, similar trait due to shared ancestry. Same form, similar traits not because of common ancestry. Resolved by gathering more data, adding more groups. Adding an outgroup, last common ancestor of groups. Construct most parsimonious tree for character matrix w/ wagner method. Based on area/continent and which broke off when. Ch 32 - animal body plans & trends. Radial - at least 2 planes of symmetry, cylinder or disk body. Equal likely to encounter prey on any side, diffuse nerve net sends signal. Equal likely to encounter prey on any side, diffuse nerve net sends signal efficiently. Bilateral - 1 plane of symmetry, long & narrow with head.
