BIO153H5 Lecture Notes - Lecture 12: Homo Sapiens, Polytomy
Document Summary
Only one species has each name (no two species will have the same name) Trees are an effective way to think about descent from common ancestry. Lamarck was the first to suggest a mechanism for evolution (talked about branches. The first to really bring home the message to fulfill the purpose of tracking origins of species was darwin. The first to combine two aspects into the tree: the classification and the idea of species changing over time. A famil(cid:455) tree (cid:449)ould(cid:374)"t (cid:271)e (cid:272)o(cid:374)sidered a ph(cid:455)loge(cid:374)eti(cid:272) tree (cid:271)e(cid:272)ause: it only looks at one species (homo sapiens) on family trees we only look at generations and possible centuries (phylogenetic trees look at centuries) Trees can reflect classification can overlay the groups that we use to classify organisms (species, genus, etc. ) We can very easily put classifications onto a tree (we can represent the very system we use for classification on a tree) Branch point/internal node: where lineages diverge (speciation event)
