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TP2_-_Méiose.pdf
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Monsieur Bernhard
September 10, 2023
Education
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TP2_-_Méiose.pdf
Monsieur Bernhard
September 10, 2023
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Transcript
➢ Dans les cellules somatiques le caryotype est diploïde :
➢ les chromosomes vont par paire : 2n=46
Que se passe-t-il dans les cellules germinales ? ➢ Dans
les cellules germinales, le caryotype est haploïde : ➢ il n’y a qu’un seul chromosome de chaque paire : n=23 ➢ Donc ces cellules NE SONT PAS produites par MITOSE. ➢ Elles sont produites par : MEIOSE.
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Dans le désordre
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Dans l’ordre Prophase 1 Métaphase 1 Anaphase 1 Telophase 1
Prophase 2 Métaphase 2 Anaphase 2 Telophase 2 2Q 2Q Q Q Q Q Q/2 Q/2
Vidéo
Animation
Animation
2n n n ? Cellule diploïde Cellules haploïdes n n
3) Les mécanismes des divisions cellulaires : B. La méïose
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Page 29
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