. 1999. Allozyme genetic distances and evolutionary relationships in marsupials of North and South America. Acta Theriologica 44: 233-242.Allozyme genetic distances and variability were studied by horizontal starch gel electrophoresis in 6 species of marsupials from North and South America representing 4 different genera. Twenty-one presumptive loci were assessed in a total of 151 specimens. Only 1 of 21 loci was found to be monomorphic in the whole sample. (Thomas, 1921) and Lutreolina crassicaudata (Desmarest, 1804). No relationships between the bradytelic condition, the karyotype stability of this group, and genetic variability were found. On the other hand, the existence of species with brief life span such as Lestodelphys halli and Monodelphis dimidiata (Marmosini tribe) and species with long life span (Didelphini tribe) allowed us to test the hypothesis which correlates generation-time with genetic variability. We conclude that a general explanation for genetic variability must involve more than just generation-time.GIBE,
En nuestra experiencia docente hemos encontrado que los alumnos tienen serias dificultades para comprender las transformaciones que sufren la materia y la energía en los seres vivos; por esta razón, decidimos elaborar una encuesta que nos permita detectar el origen de las mismas y, en consecuencia, desarrollar una estrategia didáctica basada en el desarrollo histórico del concepto de fotosíntesis y los experimentos de J. B. Van Helmontz y J. Priestley, entre otros.
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