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Clase Jueves 15
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Clase Jueves 15

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  • 1. I Gastrula II Gastrula http://www.bio.davidson.edu/courses/GENOMICS/method/UrchDev.html
  • 2. Evolucion del Huevo Zigoto Mórula Blástula Gástrula organos Neurola tejidos
  • 3. Tipos de clivages Holoblástica (segmentacion total) y Meroblástica: Holoblástula igual: se forma un tercer clivaje y se da en huevos tipo alécitos (poco vitelo) e isolécitos o oligolécitos. Holoblástula desigual: se forma un tercer clivaje y se da en huevos tipo heterolécitos. Meroblástica discoidal: se forma um disco de células y se da em huevos telolécitos. Meroblástica superficial: se da en huevos centrolécitos.
  • 4. Resumen Tipo de huevo Segmentacion Ejemplos Holoblástica igual Mamíferos y Oligolécitos osubigual equinodermos Heterolécito Moluscos, gusanos y s Holoblástica anfíbios Telolécitos Meroblástica discoidal Reptiles y aves Centrolécito s Meroblástica superficial Artropodos
  • 5. No tejidos: Tejidos diferenciados: parazoa metazoa Diploblastico Triploblastico phyla Cnidaria ctenophora Acoelomado Pseudocoelomado Coelomados rotifers, other minor Platyhelminths phyla Protostomes deuterostomes nemerteans Nematoda Arthropods Chordates Molluscs echinoderms Annelids others
  • 6. Embriologia animal Ernst Haeckel, 1866; “ontogeny recapitulates phylogeny”