{"id":8546,"date":"2023-09-19T18:59:00","date_gmt":"2023-09-19T17:59:00","guid":{"rendered":"https:\/\/exos.education\/fr\/exercice-sciences-genetique-3eme-facile\/"},"modified":"2023-08-21T14:54:30","modified_gmt":"2023-08-21T13:54:30","slug":"exercice-sciences-genetique-3eme-facile","status":"publish","type":"post","link":"https:\/\/exos.education\/fr\/exercice-sciences-genetique-3eme-facile\/","title":{"rendered":"Exercice Sciences G\u00e9n\u00e9tique 3\u00e8me Facile"},"content":{"rendered":"

Points importants du cours :<\/p>\n

1. La g\u00e9n\u00e9tique \u00e9tudie les g\u00e8nes, leur h\u00e9r\u00e9dit\u00e9 et leurs variations chez les organismes vivants.
2. L’\u00e9volution est le processus par lequel diff\u00e9rentes esp\u00e8ces d’organismes ont \u00e9volu\u00e9 \u00e0 partir de formes de vie ancestrales.
3. Les traits h\u00e9rit\u00e9s des parents peuvent \u00eatre visibles chez l’enfant ; cela s’appelle la transmission des caract\u00e8res h\u00e9r\u00e9ditaires.<\/p>\n

Consigne de l’exercice : <\/p>\n

\u00c9tudions en d\u00e9tail un exemple simplifi\u00e9 d’un trait h\u00e9r\u00e9ditaire humain : la couleur des yeux qui peut \u00eatre soit marron, soit bleu.<\/p>\n

Consid\u00e9rons que :
– Les personnes ayant les yeux marron poss\u00e8dent l’all\u00e8le M
– Les personnes ayant les yeux bleus poss\u00e8dent l’all\u00e8le B
– La couleur marron est dominante sur la couleur bleue<\/p>\n

Question :
Un couple a deux enfants. Le premier a les yeux marrons et le second a les yeux bleus. Si nous savons que chaque parent transmet un all\u00e8le \u00e0 son enfant, quels sont les all\u00e8les possibles pour chaque parent ?<\/p>\n

R\u00e9ponse :
Il est possible que chaque parent porte un all\u00e8le M (marron) dominant et B (bleu) r\u00e9cessif [MB]. En effet, cela permettrait au premier enfant d’h\u00e9riter de deux copies I’M’, donnant lieu \u00e0 une couleur d’yeux brune et au second enfant d’h\u00e9riter du all\u00e8le r\u00e9cessif ‘B’, conduisant \u00e0 une couleur des yeux blue.<\/p>\n

Cet exercice est con\u00e7u pour aider \u00e0 comprendre le concept cl\u00e9 en g\u00e9n\u00e9tique qu’est le concept de dominance des traits h\u00e9ritables \"\"\".<\/p>\n","protected":false},"excerpt":{"rendered":"

Points importants du cours : 1. La g\u00e9n\u00e9tique \u00e9tudie les g\u00e8nes, leur h\u00e9r\u00e9dit\u00e9 et leurs variations chez les organismes vivants.2. L’\u00e9volution est le processus par lequel diff\u00e9rentes esp\u00e8ces d’organismes ont \u00e9volu\u00e9 \u00e0 partir de formes de vie ancestrales.3. Les traits h\u00e9rit\u00e9s des parents peuvent \u00eatre visibles chez l’enfant ; cela s’appelle la transmission des caract\u00e8res […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[8,5,4,53,318,1],"tags":[],"class_list":["post-8546","post","type-post","status-publish","format-standard","hentry","category-sciences","category-niveaux","category-matieres","category-3eme","category-pas-dadaptation-particuliere","category-exercices-pedagogiques-imprimables-et-gratuits"],"_links":{"self":[{"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/posts\/8546","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/comments?post=8546"}],"version-history":[{"count":0,"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/posts\/8546\/revisions"}],"wp:attachment":[{"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/media?parent=8546"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/categories?post=8546"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exos.education\/fr\/wp-json\/wp\/v2\/tags?post=8546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}