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The Negritos: genetic origins and microevolution.

K Omoto

    Acta Anthropogenetica
    |January 1, 1984
    PubMed
    Summary

    Philippine Negrito groups, except the Mamanwa, cluster together genetically, showing closer ties to Southeast Asians than Africans or Australians. The Mamanwa may have distinct Proto-Malay ancestry.

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    Area of Science:

    • Population genetics
    • Human evolution
    • Anthropology

    Background:

    • The Philippines is home to diverse indigenous groups, including the Negritos.
    • Understanding the genetic relationships of these populations provides insights into human migration and adaptation.

    Purpose of the Study:

    • To genetically analyze Negrito populations in the Philippines.
    • To determine the evolutionary relationships between Negrito groups and other populations.

    Main Methods:

    • Analysis of genetic markers from 1,027 blood samples across six Philippine Negrito groups.
    • Genetic distance analysis using Nei's method with data from up to 21 polymorphic loci.
    • Examination of geographical distributions of protein variants.

    Main Results:

    • Most Negrito populations formed a distinct cluster, separate from Africans and more related to Southeast Asians.
    • The Mamanwa population showed a distinct genetic profile.
    • Negritos are genetically more similar to Southeast Asian populations than to Australian Aborigines or New Guineans.

    Conclusions:

    • The Mamanwa may have originated from the ancestral Proto-Malay population of Sundaland.
    • Negritos likely evolved from this ancestral population, possibly adapting to tropical rainforests with smaller body size.
    • Genetic data supports distinct evolutionary paths for some Philippine Negrito groups.

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