• Une mutation est dû à une modification de la séquence d'ADN.

    Comme celle illustrée ci-dessous qui montre la réaction de l'ADN aux UV :


    Il existe trois types de mutation :

    Si celle-ci a eu lieu elle peut engendrer de nouveaux caractères mais ce n'est pas parce que il y a mutation qu'il y a obligatoirement un nouveau caractère :


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