Class 02 - Sept 1

Class 02 sept 1

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: IB35ac Class 2: Our Place in Nature This lecture is a whirlwind review of the evolution of life on Earth, mammalian evolution, and a quick overview of primate evolution up to 4 million years ago. I'll talk about how the planet has changed in terms of environment, plate tectonics, orientation of continents, contingencies (asteroids), etc. IB35 Human Biological Variation Class #2, 1 Sept 2009 Monotremata (egg-laying mammals) Multituberculata (the "lost tribe" of mammals) Marsupalia (you know these guys...) Eutheria (placental mammals) Mammals Primate Evolution in 80 minutes (~1.1 million years per minute) Topics for today: ->Earth formed 4.6bya ->Prokaryotes (no nucleus) formed 3.8bya ->Eukaryotes (nucleus) formed 2.1bya ->Metazoa (animals) formed 542mya ->Mammals formed 256mya ->65mya: Asteroid hit the Earth; Dinosaurs died; Mammals radiated Hadrocodium ->First mammal species found ->Found in China ->Lived 195mya MAMMAL CHARACTERISTICS: Homeothermy: Warm-blooded; body temperature remains constant regardless of ambient temperature Heterodontism: Possess different kinds of teeth: Incisors, Canines, Premolars, Molars Lactation: Secretion of milk from mammary glands Internal gestation: Gestation occurs in womb as o...
View Full Document

This note was uploaded on 01/19/2011 for the course IB 35AC taught by Professor Hlusko during the Spring '08 term at Berkeley.

Ask a homework question - tutors are online