ANHB1101 Lecture Notes - Lecture 9: Paranthropus Aethiopicus, Foramen Magnum, Orrorin
12 Jul 2018
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Hominoidea timeline in file** evolution of the homininae: evolutionary themes (in order or occurrence) locomotion= cooling/drying climate: expansion of savannahs on a global level thin to thick enamel reduced canines reduced prognathism. Brain= cranial capacity fluctuating climate: mosaic pattern of human evolution (not progressive) long gaps. E(cid:448)olutio(cid:374) does(cid:374)(cid:859)t ha(cid:448)e fo(cid:396)(cid:449)a(cid:396)d (cid:448)isio(cid:374)> it (cid:272)a(cid:374) allo(cid:449) o(cid:396) (cid:272)o(cid:374)st(cid:396)ai(cid:374) futu(cid:396)e e(cid:448)e(cid:374)ts. Nearest relatives: chimps are our nearest living relatives> they are not our ancestors> we shared a common ancestor. Nearest common ancestor was cs 6-7 ma share ca 99% of coding dna (closely related) shared traits due to: + shared common ancestor= y-5 molars, no tails. + convergent evolution (same selective pressure affect different species and so they may evolve similarly) = male cooperation, warfare. Mid-late miocene hominoids: prognathism and brachiation (ancestral traits): Prognathism is the condition in which part of the face below the nose is pushed out.
