BIOLOGY 1M03 Study Guide - Midterm Guide: Chromosome, Parental Investment, Neritic Zone
Document Summary
Chapter 13: homo sapiens and the evolution of modern human behaviours. Long limbs small, at face with protruding chin: homo sapiens had smaller face and smaller teeth than other homonins. Small teeth evolved because homo sapiens didn"t use teeth as tools anymore. Rounded skull: had high forehead with distinguishable rounded back of the cranium. Less robust post cranial skeleton: longer limbs with thinner-walled bones. Relatively long limbs and short trunks: body proportion similar to people that lived in warmer climates and re ect the african origins of these people. *around 100 kya, there was morphologically heterogeneous collection of modern hominins: The genes that gave rise to homo sapiens evolved in africa (200 to 90 kya) A population left africa and spread across the world, replacing other hominins. (60 kya) Denisovans: a third human group that shared common ancestor as neanderthals and modern humans. Y chromosome (tmrca: the most recent common ancestor y chromosome).
