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LA POLYGENIE
Domaine Science Sous domaine Science de la Vie et de la Terre
Section Scientifique Option Math-Physique
Discipline Biologie Classe 6ème
Matériel didactique Craies de couleur Auteur SCHOOLAP.COM
Objectif opérationnel A LA FIN DE CETTE LEÇON L'ÉLÈVE SERA CAPABLE D'EXPLIQUER LA POLYGENIE.
Réference SENDEKI, BIOLOGIE 6è année, Page 84
Activité initiale

Rappel

Pourquoi peut-on faire le test chi-carré ?


 

Rappel

Le test chi-carré nous permet de juger la conformité entre les résultats observés et les résultats attendus.

 

Motivation

Lorsque l’apparition d’un caractère dépend de deux ou plusieurs couples d’allèles. Il s’agit de quoi ?

Motivation

L'apparition d’un caractère dépend de deux ou plusieurs couples d’allèles :

Il s’agit de la polygénie.

Annonce du sujet

Aujourd’hui, nous allons étudier la polygénie.

Annonce du sujet

Aujourd’hui, nous allons étudier la polygénie.

Activité principale

Analyse 

Qu’est-ce que l’épistasie ?

Qu’est-ce qu’un gène inhibiteur ?

Quelles sont les proportions statistiques des gènes inhibiteurs ?

Qu’est-ce qu’un gène complémentaire et quelles sont ses proportions ?

Exemple : chez le sorgho, un gène C provoque la formation des plantes colorées mais son allèle c l’empêche. Localisé sur un autre chromosome, le gène P et son allèle p président respectivement à la manifestation de la couleur pourpre et rouge des plantes de sorgho. Le croisement : CcPp * CcPp donne une génération de 336 graines.

Quelles sera parmi les plantes issues de ces graines, la répartition probable des génotypes et des phénotypes ?

Représentez l’échiquier de la F2.

Comment interprétez ce tableau de la F2 ?

Quels sont les génotypes, lphénotypes et leurs proportions ?

 

Analyse 

Synthèse


Ces proportions représentent celles des gènes inhibiteurs.

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