Why Do Humans Have Different Skin Colors

#prehistoriclife #ancienthumans #prehistoric #humanevolution #ancienthumans #genetics ------------------------------------------------------------------------------------------------------------------- Why Do Humans Have Different Skin Colors ------------------------------------------------------------------------------------------------------------------- Welcome to Cavexen, where we uncover the fascinating questions humans have asked for thousands of years. 🦴🔥 We explore ancient humans, prehistoric life, survival, human evolution, history, science, and strange “what if?” questions through engaging animated stories. If you're curious about how humans survived, lived, traveled, ate, and adapted before modern technology, you're in the right place. Subscribe and discover the past—one question at a time. 🌍 ------------------------------------------------------------------------------------------------------------------- 📚 RESEARCH & SOURCES: ▸ Cheddar Man DNA analysis — Natural History Museum & UCL (2018). Led by Ian Barnes, Selina Brace, Tom Booth, Chris Stringer, and Mark Thomas. Full genome sequencing of Britain's oldest near-complete skeleton (~10,000 years old) indicated "dark to black" skin pigmentation and blue eyes. https://www.ucl.ac.uk/news/2018/feb/f... ▸ La Braña individual genome — Olalde et al., "Derived immune and ancestral pigmentation alleles in a 7,000-year-old Mesolithic European" (2014, Nature) https://doi.org/10.1038/nature12960 — first complete pre-agricultural European genome, carrying ancestral (dark-skin) pigmentation alleles. ▸ Timing of the SLC24A5 light-skin sweep — Norton et al. work on selective sweep dating places the frequency rise at roughly 6,000–8,000 years ago (with wider error margins extending further back), well after initial settlement of Europe. ▸ OCA2 and East Asian skin lightening — Donnelly et al., "Association of OCA2 polymorphism His615Arg with melanin content in East Asian populations" (2010, PLoS Genetics) https://doi.org/10.1371/journal.pgen.... — independent genetic pathway to light skin in East Asia, separate from the European route. ▸ Inuit pigmentation and diet — research on Arctic populations showing higher melanin than latitude alone predicts, attributed to vitamin D-rich traditional diets (fish, seal, whale) reducing selective pressure for lighter skin. ▸ Blumenbach's five-race classification — Johann Friedrich Blumenbach, "De generis humani varietate nativa," 3rd edition (1795). Formalized the five-variety racial taxonomy (Caucasian, Mongolian, Malay, Ethiopian, American) later used to justify racial hierarchy. ———————————————————— PEOPLE & SITES MENTIONED IN THIS VIDEO: ▸ Cheddar Man — Britain's oldest nearly complete skeleton, discovered in Cheddar Gorge, Somerset, England in 1903 and dated to roughly 10,000 years old. 2018 DNA analysis revealed dark-to-black skin and blue eyes, upending a century of assumptions about what ancient Britons looked like. ▸ La Braña 1 — A ~7,000-year-old Mesolithic hunter-gatherer skeleton found in a cave system in León, Spain in 2006. His genome carried the ancestral alleles for dark skin, proving light skin hadn't yet spread across Mesolithic Europe. ▸ Johann Friedrich Blumenbach — German physician and naturalist who published a five-race classification system in 1795, ranking Europeans at the top — a framework later distorted to justify colonialism and discriminatory law, despite Blumenbach's own later objections to that use. ▸ The Inuit — Arctic populations whose diet, rich in fish, seal, and whale, supplied enough dietary vitamin D to reduce the evolutionary pressure toward lighter skin — despite living at extreme high latitudes. ▸ The Fertile Crescent / the shift to farming — The Neolithic transition, which reduced dietary vitamin D from wild game and fish and is thought to have accelerated selection for lighter skin in populations that adopted agriculture. ———————————————————— ⚠️ DISCLAIMER: This video is for educational and informational purposes only. It presents current scientific consensus on the biological and evolutionary origins of human skin color, drawn from peer-reviewed genetics and archaeology research. Historical figures and classification systems (including Blumenbach's) are discussed for historical context only and are not endorsed. This video does not intend to make any political statement and does not represent an endorsement of any racial ideology, past or present. ———————————————————— #humanevolution #SkinColorEvolution #ancienthumans #genetics #prehistory