divisiÓn celular meiosis tema 11. profase i
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DIVISIÓN CELULAR
MEIOSIS
TEMA 11
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PROFASE IPROFASE I
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PROFASE I
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mitosis-meiosis.swf
How Meiosis Works.swf
Unique Features of Meiosis.swf
meiosis McGraw.swf
Meiosis 11 PAS.swf
Meiosis-COL.swf
meiosis-SIM.swf
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Meiosis: metafase I, anafase I
METAFASE I
ANAFASE I
QuiasmaCentrómeros
En la placa ecuatorial se disponen las tétradas, unidas por los quiasmas. Los quinetocoros están fusionados y se orientan hacia el mismo polo.
No se separan las cromátidas como en la mitosis, sino cromosomas completos.
Cada cromosoma del par de homólogos, se separa hacia un polo de la célula.
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División meiótica
DIVISIÓN MEIÓTICA I DIVISIÓN MEIÓTICA II
Replicación del ADN
Cromosoma homólogo materno
Cromosoma homólogo paterno
Apareamiento de cromosomas
homólogos y recombinación
génica
Separación de cromosomas
División celular I
División celular II
Separación de cromátidas
4 gametos haploides
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LA MEIOSIS
Las células reproductoras se producen mediante un proceso llamado meiosis que reduce a la mitad el número de cromosomas. En este proceso sólo va a cada célula reproductora uno de los cromosomas de cada par de homólogos.
Esta es la razón por la que los gametos son haploides en lugar de diploides.
La meiosis
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