ANTH 102 Lecture Notes - Lecture 44: 3D Printing, Brain Size, Bipedalism
Anth 102
Introduction to Human
Origins.
Spring 2018
Becoming Human Video
Notes.
E. Development of Bipedalism
- Stood up to see over tall grass- theory
- Pick up fruit off of trees- theory
- Stood up to cool more efficiently- theory
- Saved us energy—most compelling hypothesis
- For ape ancestors—walking was tiring
- Energy demands change as forests disappear
- Had to walk more
- Walking on 2 legs evolved because saved energy theory
- Energy spending =4x for chimps walking on four legs
- Poorly designed to withstand gravity
- Small anatomic differences- large energy savings
- How long did it take?
- Molecular clock helps
- Can compare DNA of closely related species to see when they split from common
ancestor
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