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Caractères chromosomique d’idd et nombre des chromosomes

Analyse

Expo interrogative +-35’

On distingue Combien de types des chromosomes selon les caractères d’un individu ?

Que déterminent les chromosomes allosomes ?

Que veut-dire :

Pourquoi dit-on que c’est l’homme qui détermine le sexe ?

Analyse

  1. CARACTERES CHROMOSOMIQUES D’UN INDIVIDU

Selon les caractères d’un individu, on distingue deux types de chromosomes :

Les chromosomes autosomes ou allosomes : ce sont  les chromosomes responsables de la détermination de tous les caractères à l’exception du sexe. C’est ainsi qu’on les appelle chromosomes non sexuels.

Les hétérochromosomes ou hetérosomes ou encore gonosomes : ce sont les chromosomes responsables de la détermination du sexe chez l’individu, d’où le nom des chromosomes sexuels.

Ils sont de deux sortes : X et Y

-Le male a comme formule génétique XY

-La femelle a comme formule XX

N.B. : chez les animaux, c’est le male qui détermine le sexe de l’enfant car il est hétérogamétique mais la femelle a la seule possibilité de céder X.

Par contre, chez les oiseaux et les papillons c’est la femelle qui détermine le sexe des enfants. 

  1. NOMBRE DE CHROMOSOMES

Le nombre des chromosomes varie d’une espèce à une autre mais il est constant au sein des IDD d’une même espèce. On a une cellule haploïde et diploïde …

Rôles des chromosomes duplication de l’ADN.

 

 

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