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Multiregional Evolution Katina
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Multiregional Evolution Katina

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  • 1. Human Evolution The Origin of Modern Humans (Maybe)
  • 2. Multiregional Evolution Theory
    • • Since the Pleistocene (1.8 mil to 10,000 BP*) all human evolution has been within the wide-spread species Homo sapiens .
    • • Based on fossil and genetic evidence
    • • Opposite of the Single Origin Hypothesis/ Out of Africa Model
    • *BP: before present. Present=1950 AD
  • 3. Hybrid-Origin Theory
    • • Some genetic variation between races is because of genetic inheritance from at least two hominid species until the evolution of modern Homo sapiens sapiens about 35 kya
    • • Hybrid vigour means the offspring is superior to its parents because the different virtues are combined
  • 4. About Neanderthals
    • • Classified as either Homo neanderthalensis or Homo sapiens neanderthalensis
    • • Fossil evidence dates as recently as 30 kya
    • • Tools date as recently as 22 kya
    • • Almost exclusively carnivorous
  • 5. Lapedo Child • Found in Portugal • Given a ceremonial burial with pierced shell and red ochre • Was alive approximately 24.5 kya • Dental and pubic proportions say early modern human • Body proportions like leg bone length ratios say Neanderthal • Indicates mixture or ancestral pattern for late Pleistocene European humans • But the presence of a certain uniquely derived feature of Early Modern Humans refutes this • Dating and Burial style indicate child is the result of extensively admixing populations
  • 6. Mungo Man
    • • Lived about 40 kya, anatomically modern
    • • Mitochondrial DNA shows he is not descended from “Eve”
    • • A segment of his mtDNA is found in Nuclear Chromosome 11 of many people today
    • • It challenges the idea that all humans are entirely descended from common ancestors who originated in Africa within the 200,000 years
  • 7. Microcephalin
    • • Condition that causes a tiny head, usually affects the brain in some ways as well
    • • A derived form MCPH1 called Haplogroup D appeared about 37 kya
    • • May have originated from a lineage which separated from Modern humans approximately 1.1 mya
  • 8. PDHA1 on the X-chromosome
    • • Originated about 1.86 mya
    • • Division appeared about 200 kya, predating the earliest modern human fossils
    • • Suggests transformation to modern humans occurred in a subdivided population
  • 9. RRM2P4 on the X-chromosome
    • • A gene tree of it revealed a most recent common ancestor is from about 2 mya
    • • This gene present only in East Asia, resulting in higher nucleotide diversity in non-Africans than Africans
    • • Supports interbreeding between anatomically modern humans and those of Eurasia
  • 10. Are you sure you don’t have a little Neanderthal in you? Would you like to?