Resumen
The genealogy of doña Isabel Jiménez is a evidence of Spanish-Amerindian admixture since the early Spanish Colony in Costa Rica. The observed a DNA lineage wich has an Amerindian ancestry in a a deep matrilineal genealogy. Such results point out that an Amerindian gene flow had occurred into the Spanish group during the first generations of colonial society. This conclusion do not support the current idea that the Spanish elite avoided interethnic marriages.