Théorie cellulaire et division cellulaire

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24 Terms

1

Théorie cellulaire

Tous les êtres vivants sont composés de cellules.

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2

Cellule

Plus petite unité fonctionnelle d'un organisme.

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3

Division cellulaire

Processus par lequel les cellules se reproduisent.

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4

Croissance des organismes

Augmentation de la taille et du nombre de cellules.

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5

Réparation des tissus

Restauration des cellules endommagées.

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6

Remplacement des cellules

Substitution des cellules mortes ou mourantes.

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7

Cycle cellulaire

Durée moyenne de vie des cellules.

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8

Interphase

Phase de croissance et préparation à la division.

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9

G1

Croissance cellulaire et synthèse de molécules.

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10

S

Réplication de l'ADN sous forme décondensée.

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11

G2

Préparation à la division avec production de protéines.

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12

Mitose

Division du noyau et du matériel génétique.

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13

Cytocinèse

Division du cytoplasme en deux cellules.

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14

Prophase

Condensation des chromosomes et disparition de l'enveloppe nucléaire.

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15

Métaphase

Alignement des chromosomes au centre de la cellule.

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16

Anaphase

Séparation des chromatides vers les pôles opposés.

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17

Télophase

Décondensation des chromosomes et reforme de l'enveloppe nucléaire.

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18

Génome

Ensemble complet de l'ADN d'un organisme.

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19

Chromatine

Forme décondensée de l'ADN avec protéines.

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20

Gène

Segment d'ADN codant pour une protéine spécifique.

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21

Allèle

Variante d'un gène.

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22

Méiose

Division cellulaire réduisant le nombre de chromosomes.

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23

Trisomie

Présence d'un chromosome supplémentaire.

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24

Clonage

Création d'organismes identiques par reproduction.

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