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Evidencia de evolución

Los enlaces en color gris lo llevan a páginas en Inglés aún no traducidas al Español.

La evolución de los perros se representa en este árbol evolucionario. El tiempo se representa horizontalmente en el árbol. Los perros que están más cercanamente relacionados, como los perros domésticos y los lobos grises, aparecen cerca en el árbol. Científicos de la Universidad de California desarrollaron este árbol evolucionario basados en evidencias de fósiles, comparación con perros modernos, y análisis genético de DNA y proteínas.
Haz "click" en la imagen para una vista completa
Cortesía de Infraestructura de Información Biológica Nacional.

Evolución Molecular

La evolución molecular es el proceso de cómo cambian los genes de una determinada población de organismos a lo largo del tiempo. Las técnicas para explorar los genes y los cromosomas, tales como electroforesis y secuencia de DNA y RNA, permite a los científicos comparar el DNA de diferentes especies, y determinar las relaciones evolutivas. Las especies que tienen una formación genética similar tienen una relación evolutiva más cercana.

Todos los seres vivientes tienen DNA. Hay diferentes DNA en individuos de una misma especie. Hay muchas más diferencias de DNA en especies diferentes. Para deducir las relaciones evolutivas mediante el uso de DNA, los científicos comparan el DNA de diferentes especies. Las especies relacionadas de manera remota, tales como tortugas y bacterias, tienen un DNA diferente. Las especies con relación más cercana, como en el caso de los humanos y los chimpancés, tienen un 98.7% de DNA iguales, lo que indica una relación evolutiva muy cercana.

Última modificación el 16 de mayo de 2005 por Lisa Gardiner.

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