ANT203H5 Lecture Notes - Lecture 3: Phenetics, Autapomorphy, Symplesiomorphy
Document Summary
Bsc emphasizes capacity for interbreeding that results in a species: patterns of macroevolution. Adaptive radiation formation of many new species from a single ancestor due to the diverse environment available: mode and tempo. Punctuated equilibrium: rapid change followed by stasis: speciation requirement. Genetic divergence: extinction (5 mass extinctions during earth"s history) Natural succession in the life of a species: crash course, continental drift. Surface of the earth has been in constant flux due to continental drift. This is important to consider when reconstructing fossil relationships. 200mya triassic period [pangea] early evolution of dinosaurs, marine reptiles, first mammals. 180mya mid-jurassic period [laurasia + gondwana] large dinosaurs, lots of fish, first birds, early mammals. 65mya end of cretaceous period dinosaur extinction, beginning of age of mammals. Systematics the scientific classification of the diversity of organisms. Uses classification systems to help understand how organisms evolved. Grouping based on shared features to understand the evolution of organism.
