feb 10 - Africa and South East Asia Live in trees Sexual...

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Human Evolution - Natural selection occurs at individual level - Evolution occurs at population level - Fossil evidence o No bacteria o No decay - Domain (eukaria) o Kingdom (Animalia) o Phylum (chordate) o Class (mammalian) o Order (primate) o Family (hominidae) o Genus (homo) o Species (sapiens) - Order Primate o Primus (latin): first excellent noble o Arose- 65 mya (million years ago) o Ancestral common features Arboreal: related to or resembling trees Lived in trees Opposable thumbs and opposable big toe- adopted tree living Forward-looking eyes: stereoscopic vision Flat nails (no claws) Well developed forearms (ulna, radius) Primarily rely on vision- with a reduction in sense of smell Sexual dimorphism- difference in size between males and females Slow breeders Long maternal of young (years) Reduced number of teeth o New world Ranking Only found north and south America All herbivores (vegetables, fruits, seeds) All exclusively arboreal All have tails prehensile tails Not our branch o Old world ranking
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Unformatted text preview: Africa and South East Asia Live in trees Sexual dimorphic plus females usually have over physical traits (during estrous) Aggressive and territorial Omnivores (meat, vegetables) Some have tails and some don’t (not prehensile) Examples: baboons, mandrill o Homonoidea (Apes)- oldest: 25-23 mya Examples: gorilla, chimpanzee, orangutanges, bonobo, gibbons, homo sapiens All apes tailless More intelligent than old world monkeys as a group Long forearms Only found in Africa and South East Asia o What caused the speciation event? Chang in habitat, food resource India crashed into SE Asia From quadrapedalism 4 feet, to bipedalism 2 feet Suite changes to our ancestors body, change in pelvic orientation • Change in position of the head of femur • Change in spinal cord position (throat straightens out) • Fleshy buttox for sitting and counterbalance...
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This document was uploaded on 11/03/2011 for the course ECOLOGY 704 at Rutgers.

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feb 10 - Africa and South East Asia Live in trees Sexual...

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