How one small tribe conquered the world 70,000 years ago

Abstract

Genetic evidence indicates that most humans descend from a single tribe that 70,000–40,000ya rapidly replaced the entire Eurasian population while also gradually expanding within Africa. This rapid expansion of one tribe is supported by five lines of genetic evidence: (1) Y-chromosome data tracing most non-African male lineages to haplogroup CT 70,000ya; (2) mitochondrial DNA, which shows that most non-Africans descend from haplogroup L3 and its M and N branches that spread across Eurasia 70,000ya; (3) nuclear DNA analyses confirming that all non-Africans derive from a single migration event 70,000–50,000ya; (4) evidence of genetic bottleneck; (5) 2% Neanderthal DNA in all non-Africans, showing interbreeding before Eurasian dispersal. What social, cognitive, or technological advantage enabled this extraordinary expansion? The discovery of three discrete levels of language comprehension in modern individuals suggests the possibility that this ancestral tribe experienced a leap from the Modifier to the Syntactic Phenotype, unlocking unprecedented capacities for coordination, strategizing, and deception.