20 - BIO LECTURE NOTES (2/27/09) Human Evolution Key...

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BIO LECTURE NOTES (2/27/09) Human Evolution Key concepts o Chimpanzees are our closest living relatives, followed by gorillas o There were at least two major upright hominid lineages, which may have included multiple species each o The latest data strongly support recent African proliferation of modern humans Humans evolved from Old World apes, which split from the rest of the primates about 20 million years ago o New World monkeys have prehensile tails o Chimps and gorillas share a rare adaptation, knuckle walking o Great apes (family Hominidae) include orangutans, gorillas, chimpanzees, and humans Hominid phylogeny o Chimpanzees are our closest living relatives, followed by gorillas o There are several possible ways this phylogeny can be ordered o Knuckled walking might suggest gorilla and chimps should be placed together o o there were at least two major upright hominid lineages, which may have included multiple species each o Gracile species had smaller teeth and jaws, probably omnivores
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20 - BIO LECTURE NOTES (2/27/09) Human Evolution Key...

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