FACULTAD DE CIENCIAS AGROPECUARIAS EFP INGENIERIA EN INDUSTRIAS ALIMENTARIAS
Cátedra: Biología General
TEMARIO
Reproducción sexual y asexual Ciclo celular Mitosis Meiosis.
Blgo. Julio IBAÑEZ OJEDA E-mail:
[email protected]
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Reproducción Asexuada Este tipo de reproducción, similar a la división directa (también llamada fisión binaria ) de las células puede tener lugar en los organismos uni- y pluricelulares de todos los reinos. Es frecuente entre los procariotas, los protistas y los hongos; entre los vegetales y animales, sólo en las escalas taxonómicas inferiores. Las formas de reproducción asexual, excluyendo las mutaciones, producen clones de células
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Gemación o a partir de esporas
La célula duplica su acervo cromosomático encapsulando uno de ellos, alrededor del cual se forma una cubierta de espora que que protege el contenido de la nueva célula que permanece latente hasta que las condiciones propicias produzcan su germinación por absorción de agua y pérdida de la cubierta. Entre los procariotas este modo es usado cuando el organismo ha agotado la fuente de nutrición. Existen hongos, plantas y animales (v.gr., la hydra) que se reproducen a través de esta forma; Fragmentación de filamentos
Es el caso de algunos hongos: las esporas asexuales se forman en cadenas en el ápice de una hinfa especializada; se caracterizan por ser muy finas y son llamados conidios ; también puede ocurrir en el reino animal en las escalas inferiores (v.gr., las esponjas) y entre los musgos cuyos fragmentos reproductores son conocidos como propágulos
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Reproducción sexual La mayoría de los organismos eucarióticos se reproducen sexualmente lo cual requiere de dos padres e implica dos fenómenos: la meiosis y la fecundación . Los organismos sexuados no se reproducen más que a partir de organismos de la misma especie, una barrera genética los separa de los organismos de otras especies (salvo en los raros casos de ). Para pasar a la generación sexual hibridación natural ). siguiente, se deberá en un momento dado del ciclo biológico, realizar una reducción a la mitad del número de
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La meiosis da por resultado de la división celular, células hijas con carga cromosomática reducida; se realiza solamente en las células germinales cuando éstas producen gametos -las células sexuales-, cuya dotación será así, haploide . El proceso o gametogénesis puede tener lugar en distintas fases del ciclo biológico, según los organismos, de allí que los tipos de meiosis sean: cigótica (que se lleva a cabo después de la unión de las células que se aparean), (en espórica (durante la formación de la espora) y somática (en los órganos sexuales productores de los gametos). En la
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El ciclo de una célula es análogo al de un ser vivo, "nace" mediante la división
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El ciclo celular comprende cuatro períodos
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INTERFASE Este instante celular, que no pertenece a la mitosis, pero si al ciclo celular. Es el momento de mayor actividad metabólica. Ocurren: • Autorreproducción de los cromosomas y multiplicación de los centriolos, • Síntesis de las moléculas proteicas que formaran el aparato mitótico (husos, asteres, centriolos, estructuras nucleares y cromosomicas), del núcleo celular modificaciones del citoplasma
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FUNCIÓN
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DIVISIÓN MEIOTICA II Los procesos de esta división son semejantes a los de una mitosis en una célula haploide. PROFASE II: Se condensan los cromosomas, se desintegran los nucleolos, los centríolos migran a los polos y se duplican, formación del huso acromático y se desorganiza la envoltura nuclear. PROMETAFASE II: Los cromosomas condensados migran a la placa ecuatorial de la célula. METAFASE II: Los cromosomas se alinean en la placa ecuatorial, y cada cromosoma se une a una fibra del huso acromático. ANAFASE II:
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Las cromátidas cromosomas se Los se separan condensan Los cromosomas Cada una de las cinetocoros de convirtiéndose
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Citocinesis Separación Separación de los citoplasmas de las células hijas. El proceso melótico parte de una célula diploide que da como resultado 2 haploides, y a partir de éstas dos (melosis II) se obtienen 4 haploides. Meiosis, variabilidad genética y evolución La reproducción sexual introduce una importante proporción de variaciones genéticas. Cuanto mayor sea la diversidad de gametas formadas en cada progenitor, mayor será la probabilidad de originar combinaciones diferentes por fecundación, y mayor será la diversidad de los descendientes. Una célula diploide, con 2 pares de cromosomas homólogos, originará por meiosis 4 gametas haploides (uno de la madre y otro del padre). En la Metafase I se va a determinar en qué sentido migrarán en la Anafase I. Hay dos opciones:
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DIFERENCIAS ENTRE ESPERMATOGENESIS Y OVOGENESIS •
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Los gonocitos (células germinales primarias) aparecen en la mujer a los 20 dias de vida embrionaria, en la pared del saco vitelino. Los gonocitos en 5ta semana migran a los esbozos gonadales, donde forman oogonias que se rodean de células foliculares y forman el foliculo primario. Al final del 3er mes, la oogonia entra a meiosis y se convierte en ovocito I. El ovocito I queda estático en el diplonema hasta los 12 años. La mujer al nacer nacer,, presenta 1 millon de ovocitos I, degenerándose la may mayoría. oría. A los 7 años hay 300 mil ovocitos I, de ellos solo 400 alcanzan la madurez entre los 12 y 50 años, aumentando las malformaciones malformaciones por edad. La 1ra division meiotica se da cuando el ovulo entra a las trompas, liberando el 1er globulo polar, y en la fecundación se libera el 2do GP. En el hombre, las espermatogonias se forman en los tubulos seminiferos después que los gonocitos mig de los esbozos gonadales.
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