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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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Large-scale Reconstructions and Independent, Unbiased Clustering Based on Morphological Metrics to Classify Neurons in Selective Populations
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Reconstruyendo la historia de la población indígena americana.

David Reich1, Nick Patterson, Desmond Campbell

  • 1Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA. reich@genetics.med.harvard.edu

Nature
|July 18, 2012
PubMed
Resumen
Este resumen es generado por máquina.

Los nativos americanos trazan la ascendencia de al menos tres corrientes de flujo genético asiáticas. El poblamiento inicial involucró la migración costera, con un flujo genético limitado después de la división de la población, particularmente en América del Sur.

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Área de la Ciencia:

  • Genética de la población Genética de la población.
  • Estudios de Migración Humana Estudios de Migración Humana
  • Arqueogenética La arqueogenética.

Sus antecedentes:

  • El poblamiento de las Américas es un tema complejo con un debate en curso con respecto a los eventos de migración única o múltiple desde Siberia.
  • Investigaciones anteriores han utilizado datos genéticos, arqueológicos y lingüísticos, pero se necesita una mayor resolución para resolver preguntas clave.
  • Comprender los patrones de dispersión dentro de las Américas sigue siendo un desafío significativo.