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LE CHROMOSOME
Domaine Science Sous domaine Science de la Vie et de la Terre
Section Scientifique Option Biologie Chimie
Discipline Biologie Classe 6ème
Matériel didactique IMAGES Auteur SCHOOLAP.COM
Objectif opérationnel AU TERME DE CETTE LEÇON L'ÉLÈVE SERA CAPABLE DE DECRIRE LES CHROMOSOMES.
Réference A. KALEB. Biologie 6èm année ed 2015.
Activité initiale

Rappel 

De quoi est constituée une cellule ?                 

Rappel 

Une cellule est composée de : noyau, membrane cytoplasmique,cytoplasme.

Motivation 

Que trouve-t-on dans le noyau ? 

Motivation 

Dans le noyau, on trouve la chromatine, le nucléole...                                                                  

Annonce du sujet 

Aujourd’hui nous étudions le chromosome.

Annonce du sujet 

Aujourd’hui nous étudions le chromosome.

Activité principale

Analyse 

Expo interrogative ±  40′                          

 

Le chromosome, qu’est-ce ?                     

                           

 

 

 

 

De quoi est composé un Chromosome ?     

 

 

 

 

Quelles sont les différentes formes de chromosomes  ?

 

 

 

 

 

 

 

Qu'and parle-t-on d’un chromosome acrocentrique ?                                                                                     

Analyse 

LES CHROMOSOMES

 

  1. Définition : les  chromosomes sont des filaments nucléoprotéiques renfermant l’ADN, observables pendant la division cellulaire.

Ils portent de matériel génétique

2 . Composition d’un chromosome 

Un chromosome est composé de :

  1. Histone
  2. Chromonema
  3. Centromère
  4. Bras chromosomique ou chromatides.

 

  1. Formes de chromosomes

  Il existe plusieurs formes : U, V, bâtonnet, point, anc…

En fonction  de l’emplacement des  centromères, on distingue :

  1. Chromosomes métacentriques

Deux bras égaux avec un centromère médian.

Centromère

  1. Chromosomes acrocentriques

Un bras court et l’autre long

C)  Chromosomes théocentriques

 Le centromère est placé à l’extrémité ;

On a donc un seul bras.

 

d) Chromosomes ponctiformes ou punctiformes

les deux bras sont confondus avec le

centromère.

Synthèse

Le chromosome telo centrique à un seul bras alors que le chromosome punctiforme à les deux bras confondus  avec le centromère.

Le chromosome telo excentrique à un seul bras alors que le chromosome punctiforme à les deux bras confondus  avec le centromère.

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