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Human Brain and Race Notes

Single race perhaps some isolated breeding

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Unformatted text preview: ar Genes o Genomic sequences of 3 races: Range of polymorphisms within a race is greater than range of differences between any 2 individuals of different races Few genes are race specific o Genetic conclusion: Single race! Perhaps some isolated breeding populations, but not enough time in isolation to form subspecies Races? o Primarily a social construct o Biologically applicable only for populations that remain isolated for long periods of time • • • • • • No longer possible today African Hominins: 4 Groups o Gracile Australopithecus 4 species: A. africanus, A. afarensis, A. anamensis, A. garhi Small: 1.5 m height, 36 kg weight, ~450 cc braincase vol o Robust Australopithecus 3 species: Paranthropus aethiopicus, P. robustus, P. boisei Small but heavier, ~510 cc braincase vol with massive cheek teeth and jaws, large cheekbones, sagittal crest o Early Homo species 3 species: H. habilis, H. ergaster, H. erectus Taller & heavier, ~550 ­1000 cc braincase col with smaller jaws and teeth and flatter/narrower faces o Recent Homo species 4 species: H. heidelbergensis, H. neanderthalensis, H. floresiensis, H. sapiens With exception of H. floresensis, larger, heavier, with flatter faces, smaller teeth and jaws, ~1200 ­1500 cc braincase vol What Kept Early Brains Small? o Constraints on crani...
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