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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Type IV Collagen of Basal Lamina01:05

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Cranial Bones: Superior and Posterior View01:14

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Video Experimental Relacionado

Updated: Jul 16, 2026

Scleral Cross-linking Using Riboflavin and Ultraviolet-A Radiation for Prevention of Axial Myopia in a Rabbit Model
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Published on: April 3, 2016

Los lados afilados de la superpluma africana.

Sidao Ni1, Eh Tan, Michael Gurnis

  • 1Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA. stone@gps.caltech.edu

Science (New York, N.Y.)
|June 8, 2002
PubMed
Resumen

Una enorme estructura de tierra profunda debajo del sur de África muestra un límite afilado e inclinado. Esto sugiere una capa química densa dentro de un penacho térmico que fluye hacia arriba, lo que indica inestabilidad dinámica.

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Área de la Ciencia:

  • La geofísica es la geofísica.
  • Sismología Sismología Sismología.
  • Ciencias de la Tierra Ciencias de la Tierra

Sus antecedentes:

  • Una estructura grande y anómala existe debajo del sur de África, originada en el límite núcleo-manto.
  • Esta estructura tiene aproximadamente 1200 km de ancho y se extiende 1500 km hacia arriba.
  • Muestra una reducción de la velocidad de cizallamiento de alrededor del 3%.

Objetivo del estudio:

  • Para caracterizar con precisión la estructura y los límites de la anomalía de la tierra profunda debajo del sur de África.
  • Para investigar los procesos dinámicos y la composición de esta característica geológica a gran escala.
  • Para entender las implicaciones de la estructura de la anomalía para la dinámica del manto.

Principales métodos:

  • Análisis de las fases sísmicas SKS que atraviesan el lado este de la anomalía.
  • Análisis detallado de la velocidad sísmica para determinar los límites estructurales.
  • Desarrollo y prueba de modelos dinámicos limitados por datos sísmicos.

Principales resultados:

  • El límite oriental de la anomalía es agudo, con un ancho de menos de 50 km.
  • El límite exhibe una inclinación hacia afuera desde el centro de la estructura.
  • Los modelos dinámicos indican una capa química densa dentro de una estructura térmica que fluye hacia arriba.

Conclusiones:

  • El límite afilado e inclinado sugiere la inestabilidad dinámica de la estructura de la tierra profunda en escalas de tiempo geológicas.
  • Los hallazgos apoyan modelos que involucran capas químicas densas que interactúan con plumas térmicas.
  • Esta investigación proporciona nuevos conocimientos sobre la compleja dinámica en el límite núcleo-manto.