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Chapitre 2 la r plication de l adn

Chapitre 2 la r plication de l adn

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Chapitre 2 : La réplication de l’ADN

Comment l’ADN est-il répliqué à l’identique afin de ne pas perdre d’information

génétique ?

I – Rappels : Structure et rôles de la molécule d’ADN.

ADN= Acide désoxyribose nucléique

L’ADN est le support universel de l’information génétique, cette molécule très

longue est composée d’une succession de nucléotides reliés les uns aux autres

par des liaisons hydrogène.

Un nucléotide est toujours constitué d’un sucre(désoxyribose), d’un phosphate,

et d’une base azotée.

Quatre nucléotides différents par leurs bases azotées :

- L’adénine

- La cytosine

- La guanine

- La thymine

Les bases azotées sont complémentaire deux à deux :

A -> T

G -> C

Et inversement . Une molécule d’ADN correspond une chromatide.

Avant chaque division cellulaire, afin de conserver l’information génétique de la

cellule, durant la phase S de l’interphase, les molécules d’ADN sont répliquées

pour former un deuxième chromatide et donc des chromosomes dupliqués.

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Chapitre 2 : La réplication de l’ADN Comment l’ADN est-il répliqué à l’identique afin de ne pas perdre d’information génétique ? I – Rappels : Structure et rôles de la molécule d’ADN. ADN= Acide désoxyribose nucléique L’ADN est le support universel de l’information génétique, cette molécule très longue est composée d’une succession de nucléotides reliés les uns aux autres par des liaisons hydrogène. Un nucléotide est toujours constitué d’un sucre(désoxyribose), d’un phosphate, et d’une base azotée. Quatre nucléotides différents par leurs base ...
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