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Genetic variation in Brac, Croatia.

D F Roberts1, Z M Noor, S S Papiha

  • 1Department of Human Genetics, University of Newcastle upon Tyne.

Annals of Human Biology
|November 1, 1992
PubMed
Summary
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Genetic variation exists on Brac Island, Croatia, influenced by settlement history and local marriage patterns. This study reveals significant local genetic differences within the island population.

Area of Science:

  • Population genetics
  • Human evolution
  • Island biogeography

Background:

  • Island populations often exhibit unique genetic profiles due to isolation.
  • Understanding local genetic variation is key to reconstructing population history.

Purpose of the Study:

  • To investigate local genetic variation on the Dalmatian island of Brac.
  • To identify factors contributing to observed genetic heterogeneity within the island.

Main Methods:

  • Serological survey of 747 subjects from Brac Island.
  • Analysis of gene frequencies across different village types (inland, coastal).

Main Results:

  • Significant local genetic variation detected across Brac Island.

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  • Heterogeneity observed between inland and coastal villages, and within coastal areas.
  • Variation also noted among older inland villages.

    • Conclusions:

    • Island settlement processes (founder effect) likely shaped genetic diversity.
    • Random genetic drift and localized marriage patterns contributed to heterogeneity.
    • Brac Island serves as a model for studying microevolutionary processes in isolated populations.