12-15primates_Lecture 42

12-15primates_Lecture 42 - Last time we learned: the...

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5/10/11 Last time we learned: the distinguishing features of mammals, that mammals occur in 5 major clades, that whales evolved from land-dwelling ancestors via semi-aquatic relatives, providing an evolutionary case study. We emphasized again that variation does not arise from need . Adaptations do not arise to accomplish
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5/10/11 Order Primates are mammals with grasping hands, opposable thumbs, & nails instead of claws— allowing precision grip are primarily tree-dwelling (arboreal) have large brain, acute binocular vision have complex social behavior & parental care evolved from insect-eating ancestors about 85 mya include humans
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5/10/11 Smaller, nocturnal vs larger, active in daytime
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5/10/11 1. Monkeys mostly have tails 2. Apes (hominoids) tail-less, more mobile shoulder joints, broader rib cages, shorter spine—foster brachiation , hand- over-hand movement through Anthropoi ds:
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5/10/11 Old World primates have trichromatic color vision : New world primates Old world primates including humans Helps arboreal primates locate tender young (red) leaves & ripe fruit in a densely-green canopy Gene duplication event Ancestral trait: Most mammals have dichromatic color vision based on an autosomal blue-sensor gene & an X-linked green-sensor gene New X- linked red-sensor 30 mya
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12-15primates_Lecture 42 - Last time we learned: the...

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