BIO 1130 Lecture Notes - Lecture 6: Kiss Principle, Phylogenetic Tree, Willi Hennig

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

20th century: modern biology ( 70 years old) Hennig gave us new way to look at the living world. Cladogram: break off from trees forks nested hierarchy by shared characteristics. Human has its own species hominidae because we think we are superior and nothing compares, but in a molecular level we share 95% dna with chimpanzee. Apomorphies derived characteristics within a group (evolutionary lineage) (will evolve to have characteristics) Plesiomorphies primitive characters within a group (everyone has in group) Symplesiomorphies shared primitive characteristics that are shared between groups. Cladogram construction 0 shared (out group = 0 for all) Tally it up and put in order of numbers. Parsimoney the kiss principle simplest explanation keep it simple, stupid. Monophyletic: one common ancestor and we know all its decedents. Paraphyletic : one group is not in the proper analyst usually by misanalysis (problematic)