Tableau récapitulatif des évènements cytologiques de la méiose.

Schémas

Description rapide

 Condensation des chromosomes  Disparition de l’enveloppe nucléaire  Appariement des chromosomes homologues

Les paires de chromosomes se placent sur le plan équatorial qui définit la plaque métaphasique

Les chromosomes homologues de chaque paire se séparent et migrent à un pôle. Le hasard entraine un brassage interchromsomique

Le cytoplasme commence sa division et donne naissance à 2 cellules filles haploïdes à chromosomes bichromatidiens

Chaque chromosome se place perpendiculairement à la 1ère division

Chaque chromosome bichromatidiens se place sur le nouveau plan équatorial

Dans chaque cellule fille, les chromatides de chaque chromosome se séparent et migrent à un pôle

Dans chaque cellule fille apparaît une cloison médiane qui donne naissance à 4 cellules filles haploïdes à chromosomes monochromatidiens

Etape

Prophase 1

Métaphase 1

Anaphase 1

Télophase 1

Prophase 2

Métaphase 2

Anaphase 2

Télophase 2

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