Chapter 17- Human Evolution

Chapter 17- Human Evolution - Chapter 17(Continued Human...

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Click to edit Master subtitle style Chapter 17 (Continued): Human Evolution
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Mammals Early mammals were very small Mammals eventually evolved live birth But monotremes still lay eggs Hair allows greater activity Day or night Leaving more energy for hunting food and for reproduction
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Early Primates Early primate ancestors existed about 55 mya Shrew-like, lived in trees Evolved into forms similar to modern primates, which still maintain many of the characteristics of their early ancestors Monkeys, lemurs, tarsiers Eat fruit, leaves Maybe nocturnal Tree-dwelling
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Primate Characteristics Primates, including humans, retain characteristics that were seen in the earliest ancestors. These characteristics are believed to have lead the evolution of modern humans . 1. Grasping hands 2. Binocular vision 3. Large brain
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Grasping hands For climbing trees in tree-dwelling (monkey/ape) ancestors. Power grip Precision grip
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Binocular Vision Forward-facing eyes Accurate Depth Perception For navigating trees Probably had color vision like we have today Easier to choose ripe fruit
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Big Brains / Skull Structure Large relative to body size Skull size gets larger as the brain gets larger Navigating complex environments (quickly) Brain cavity is larger in human ancestors than tree- dwelling (monkey/ape) ancestors.
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Tree-dwelling (monkey/ape) ancestors have larger jaws and a prominent brow ridge . The
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This note was uploaded on 05/27/2011 for the course BIO 112 taught by Professor Kirkpatrick during the Spring '11 term at Moraine Valley Community College.

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Chapter 17- Human Evolution - Chapter 17(Continued Human...

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