BIOLOGY 1M03 Lecture Notes - Lecture 16: Aboriginal Australians, Prognathism, Microcephaly
12 Jul 2017
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Out of africa/complete replacement hypothesis: proposes that modern humans dispersed out of africa, and replaced populations of h. erectus and neanderthals without interbreeding. Australian aborigines: but these features could be conversantly evolved, or simple a polymorphic ancestral feature (for example, ben"s signal keel and occipital torus does not prove he is h. erectus) Insular dwarfism: small size could be advantageous for reproduction if associated with decreased gestation and generation time, also if food is scarce. Insular giganticism: sometimes species get larger on islands, not smaller, this could also be related species becoming predators on islands because of the absence of other predators, or because decreased predation pressure allows species to be large. Neanderthal morphology: faces that bulge in the middle, large brow ridges, rounded back of the skull, large cranial capacity, around 1400 cc - larger than modern humans. Thursday, february 16, 2017: robust, heavily muscled bodies.
