BIOL 1070 Lecture Notes - Lecture 5: Paraphyly, Invertebrate, Cladogenesis

• School: University of Guelph
• Department: Biology
• Course: BIOL 1070
• Professor: Shoshanah Jacobs Ryan Gregory

Document Summary

Clade: a group of organisms that consist of a common ancestor and all its lineal descendants. Paraphyletic group: not a clade (missing either a common ancestor or at least one descendant) Reptiles isn"t a clade because it leaves out birds (they"re more closely related to crocodiles than they are to the others), also fish or invertebrate. The formation of new species is called speciation. Most often, this involves an ancestral species splitting or branching into two descendant species. Assess the relatedness by shared ancestry (not counting the number of nodes) Notate internal nodes, order of tips don"t say anything.