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

ORCiD logo with link | Boston UniversityBostonMA
Published online: 6 August 2026
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https://doi.org/10.1075/elt.26004.vys
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.
Article outline
  • Introduction
  • Genetic evidence
    • 1.Evidence from Y-chromosome
    • 2.Evidence from mitochondrial DNA
    • 3.Evidence from nuclear DNA
    • 4.Reduction in genetic diversity (genetic bottleneck)
    • 5.Introgression of Neanderthal DNA in all non-Africans
    • Conclusions from genetic evidence
  • What unique social, cognitive, or technological advantage enabled the expansion of the CT/L3 tribe?
    • 1.Robin Dunbar’s social brain hypothesis
    • 2.Technological advantage
    • 3.Climate change
    • 4.Toba supervolcano eruption
    • 5.Acquisition of speech
  • Discrete language comprehension development
  • Archeological markers of the Syntactic Phenotype
    • 1.Figurative drawings
    • 2.Religious burials
    • Conclusions from archeological evidence
  • Discussion
  • Geographic location of the CT/L3 tribe when it transitioned from the Modifier Phenotype to the Syntactic Phenotype
  • Expansion of the CT/L3 tribe inside Africa
  • Gene–culture evolution can proceed far more abruptly than genetic evolution alone
  • The critical period for acquisition of the Syntactic Phenotype
  • Genetic regulation of the critical period duration and its role in the evolutionary acquisition of the Syntactic Phenotype
  • The global spread of the Syntactic Phenotype was primarily a cultural sweep, rather than a purely genetic sweep
  • Conclusions
  • References
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