ANTHR101 Lecture Notes - Lecture 4: Sickle-Cell Disease, Tibetan People, Forensic Anthropology
17 Jan 2018
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For example, blood types: three alleles expressed in four phenotypes: a (aa and o), b (bb and o), ab (ab) and o (oo). Different frequencies in different populations: regionally phenotypic species like homo sapiens are polytypic species (dogs would be another example, environment, culture. Hominins evolved to walk, jog, or run steadily in hot climates. They have a diet naturally high in vitamin d from fish and marine mammals. Body build: people leaner and longer limbed in warm climates, stockier and shorter limbed in cold ones (for heat loss/heat retention). Probably genetic in part; however: this is an instance of environmental impact on development, an epigenetic effect: see changes in human offspring within a few generations after migration to warmer or colder climates. Cranial and facial features (*generally speaking*: populations from colder areas have rounder skulls, from warmer areas, narrower ones, cold, arid climates: longer, narrower noses; warm, moist climates: shorter, broader noses.
