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Home > Art, Film & Photography > Procesos Evolutivos: Especiacion, Especie, Seleccion Natural, Mecanismos de Aislamiento Reproductivo, El Origen de Las Especies, Alopatria
Procesos Evolutivos: Especiacion, Especie, Seleccion Natural, Mecanismos de Aislamiento Reproductivo, El Origen de Las Especies, Alopatria

Procesos Evolutivos: Especiacion, Especie, Seleccion Natural, Mecanismos de Aislamiento Reproductivo, El Origen de Las Especies, Alopatria


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Fuente: Wikipedia. Paginas: 32. Capitulos: Especiacion, Especie, Seleccion natural, Mecanismos de aislamiento reproductivo, El origen de las especies, Alopatria, Especiacion alopatrica, Especiacion simpatrica, Explosion cambrica, Equilibrio puntuado, Especies gemelas, Monstruo prometedor, Efecto fundador, Natura non facit saltus, Radiacion adaptativa, Uniformismo, Gradualismo, Especiacion parapatrica, Cronoespecie, Teoria transformista, Cladogenesis. Extracto: En Biologia, los mecanismos de aislamiento reproductivo o barreras a la hibridacion son el conjunto de caracteristicas, comportamientos y procesos fisiologicos que impiden que los miembros de dos especies diferentes puedan cruzarse o aparearse entre si, producir descendencia o que la misma sea viable o fertil. Estas barreras constituyen una fase indispensable en la formacion de nuevas especies (especiacion) ya que mantienen las caracteristicas propias de las mismas a traves del tiempo debido a que disminuyen, o directamente impiden, el flujo genetico entre los individuos de diferentes especies. Han sido propuestas varias clasificaciones de los mecanismos de aislamiento reproductivo. El zoologo Ernst Mayr los ha clasificado en dos categorias amplias: mecanismos precopulatorios y poscopulatorios. Los primeros actuan antes de que se pueda producir la fecundacion (es decir, antes del apareamiento en el caso de los animales o de la polinizacion en el caso de las plantas). Tales mecanismos precopulatorios, tambien denominados -barreras externas a la hibridacion-, son las separaciones fisicas en el tiempo, en el espacio, ambientes, nichos ecologicos especificos y diferencias en el comportamiento que impiden el apareamiento o la polinizacion. Los mecanismos poscopulatorios, o -barreras internas a la hibridacion-, en cambio, operan a traves de la falta de armonia entre los sistemas fisiologicos, reproductivos o citologicos de los individuos pertenecientes a diferentes especies. Los diferentes mecanismos de aislamie...


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Product Details
  • ISBN-13: 9781231558959
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 246 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Weight: 82 gr
  • ISBN-10: 1231558954
  • Publisher Date: 26 May 2011
  • Binding: Paperback
  • Language: Spanish
  • Returnable: N
  • Sub Title: Especiacion, Especie, Seleccion Natural, Mecanismos de Aislamiento Reproductivo, El Origen de Las Especies, Alopatria
  • Width: 189 mm


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