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Videos de Conceptos Relacionados

Gene Flow02:39

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Formation of Species01:31

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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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Updated: Dec 15, 2025

Manipulation of Gene Function in Mexican Cavefish
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El flujo de genes nativos americanos en la Polinesia es anterior al asentamiento de la Isla de Pascua

Alexander G Ioannidis1,2, Javier Blanco-Portillo3, Karla Sandoval3

  • 1Institute for Computational and Mathematical Engineering, Stanford University, Stanford, CA, USA. ioannidis@stanford.edu.

Nature
|July 10, 2020
PubMed
Resumen
Este resumen es generado por máquina.

El análisis genético revela el contacto prehistórico entre las poblaciones polinesias y nativas americanas alrededor del año 1200. Esta evidencia apoya las antiguas interacciones transpacíficas, desafiando los debates anteriores sobre los orígenes de los cultivos del Nuevo Mundo en Polinesia.

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Área de la Ciencia:

  • Genética de las poblaciones
  • Arqueogenética
  • La migración humana

Sus antecedentes:

  • El potencial para el contacto de viajes prehistóricos entre las poblaciones polinesias y nativas americanas sigue siendo un tema de debate científico.
  • La evidencia como la presencia de cultivos del Nuevo Mundo (por ejemplo, la batata dulce, la calabaza de botella) en la Polinesia ha alimentado las teorías de contacto transpacífico.
  • Los estudios genéticos anteriores han dado resultados contradictorios, dejando la cuestión sin resolver.