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            <video:description>Les cellules spermatiques et les ovules, appelés gamètes, fusionnent lors de la fécondation pour créer un zygote. Les gamètes possèdent la moitié des chromosomes (haploïdes) d’une cellule corporelle typique, tandis que les zygotes possèdent l’ensemble complet (diploïdes). Les chromosomes homologues provenant de chaque parent déterminent les caractères, y compris le sexe. Comprendre les nombres haploïdes et diploïdes est essentiel pour l’étude de la division cellulaire et de la génétique.</video:description>
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