Explore the principles of evolutionary anthropology, including natural selection, adaptation, human evolution, and the role of genetics in shaping human behavior and physical characteristics.
Evolutionary Anthropology – Quick‑Reference Notes
| Concept | Description |
|---|---|
| Evolutionary Anthropology | The sub‑field of anthropology that applies evolutionary theory to understand the origins, development, and variation of human biology, behavior, and culture. |
| Core Questions | • How did the human species arise? • What adaptive pressures shaped our anatomy, cognition, and sociality? • How do biological and cultural evolution interact? |
| Key Disciplines Integrated | Paleoanthropology, biological anthropology, genetics, primatology, archaeology, comparative psychology, and cultural evolution studies. |
| Theory | Main Idea | Representative Proponents |
|---|---|---|
| Darwinian Natural Selection | Differential reproductive success leads to adaptation. | Charles Darwin, George C. Williams |
| Modern Synthesis | Merges Mendelian genetics with natural selection; emphasizes population genetics. | Theodosius Dobzhansky, Ernst Mayr |
| Evolutionary Developmental Biology (Evo‑Devo) | Developmental pathways constrain and channel evolutionary change. | Sean B. Carroll |
| Gene‑Culture Coevolution | Genes and culture evolve reciprocally; cultural traits can alter selection pressures. | Robert Boyd, Peter J. Richerson |
| Inclusive Fitness & Kin Selection | Altruistic behavior can evolve if it benefits relatives sharing genes. | W. D. Hamilton |
| Reciprocal Altruism & Mutualism | Cooperation can evolve when individuals gain long‑term benefits from repeated interactions. | Robert Trivers |
| Self‑Domestication Hypothesis | Selection against aggression leads to morphological and behavioral changes (e.g., reduced facial robusticity). | Richard Wrangham, Brian Hare |
| Transition | Timeframe (approx.) | Key Anatomical / Behavioral Changes | Evidence |
|---|---|---|---|
| Bipedalism | 6–7 Ma → 4 Ma | • Pelvic shortening, valgus knee • Foot arches, heel strike |
Fossils: Australopithecus afarensis (Lucy), Orrorin tugenensis |
| Brain Expansion | 2 Ma → present | • Cranial capacity ↑ from ~600 cc to >1,350 cc • Reorganization of prefrontal cortex |
Endocasts, cranial measurements |
| Tool Use & Manufacture | 2.6 Ma (Oldowan) → 50 ka (Upper Paleolithic) | • Stone flaking, hafting, composite tools • Planning, foresight |
Archaeological assemblages (e.g., Lomekwi, Olduvai, Levallois) |
| Control of Fire | ~1 Ma (controversial) → 400 ka (secure) | • Cooking, heat regulation, night activity • Social gathering around hearths |
Hearths, burned bones, thermoluminescence dating |
| Language Emergence | 200–100 ka (est.) | • Complex vocal tract, FOXP2 changes, symbolic behavior | Endocasts, symbolic artifacts (ochre, beads) |
| Complex Social Structure | 150 ka → present | • Large, cooperative groups, pair‑bonding, kin networks | Burial sites, art, settlement patterns |
| Agricultural Revolution | ~12 ka | • Domestication of plants/animals, sedentism • Population growth, disease exposure |
Plant remains, |