{"id":1191,"date":"2019-11-14T15:29:07","date_gmt":"2019-11-14T14:29:07","guid":{"rendered":"https:\/\/svt-dalaine.fr\/svt\/?page_id=1191"},"modified":"2019-11-14T17:30:59","modified_gmt":"2019-11-14T16:30:59","slug":"theme-1-a-la-terre-la-vie-et-lorganisation-du-vivant-genetique-et-evolution","status":"publish","type":"page","link":"https:\/\/svt-dalaine.fr\/svt\/theme-1-a-la-terre-la-vie-et-lorganisation-du-vivant-genetique-et-evolution\/","title":{"rendered":"Th\u00e8me 1-A-La Terre, la vie et l&#8217;organisation du vivant: G\u00e9n\u00e9tique et \u00e9volution"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1191\" class=\"elementor elementor-1191\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-367aaa4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"367aaa4\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-bed47a5\" data-id=\"bed47a5\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f4ad74b elementor-widget elementor-widget-text-editor\" data-id=\"f4ad74b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Dans ce <strong>Th\u00e8me 1-A-G\u00e9n\u00e9tique et \u00e9volution<\/strong>, il s&#8217;agit d&#8217;un approfondissement des concepts de biodiversit\u00e9 et d&#8217;\u00e9volution. Ce th\u00e8me 1-A comprend 4 chapitres.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-dae89ec\" data-id=\"dae89ec\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0087329 elementor-widget elementor-widget-image\" data-id=\"0087329\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"http:\/\/resistance-verte.over-blog.com\/2016\/03\/agir-pour-la-biodiversite.html\" target=\"_blank\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"435\" src=\"https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2019\/11\/ob_743cdc_la-biodiversite.jpg\" class=\"attachment-large size-large wp-image-1220\" alt=\"\" srcset=\"https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2019\/11\/ob_743cdc_la-biodiversite.jpg 600w, https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2019\/11\/ob_743cdc_la-biodiversite-300x218.jpg 300w, https:\/\/svt-dalaine.fr\/svt\/wp-content\/uploads\/2019\/11\/ob_743cdc_la-biodiversite-360x261.jpg 360w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-34e0823 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"34e0823\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-bffca1f\" data-id=\"bffca1f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-dfbf3f4 elementor-widget elementor-widget-text-editor\" data-id=\"dfbf3f4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>Chapitre 1-A-1 L&#8217;origine du g\u00e9notype des individus.<\/strong><\/p><p><strong>Chapitre I. La conservation des g\u00e9nomes : stabilit\u00e9 g\u00e9n\u00e9tique et \u00e9volution clonale<\/strong><\/p><p><span style=\"text-decoration: underline;\">I. les mitoses, produisent des clones cellulaires<\/span><\/p><p>Le clone sera abord\u00e9 via &#8220;l&#8217;attaque des clones&#8221; par une lecture autonome du TP0 ci-contre.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-f4e331d\" data-id=\"f4e331d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-32f9d9f elementor-widget elementor-widget-text-editor\" data-id=\"32f9d9f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div style=\"width: 100%;\"><div style=\"position: relative; padding-bottom: 56.25%; padding-top: 0; height: 0;\"><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" src=\"https:\/\/view.genial.ly\/5d838e3eb7e84f0f6c7df863\" width=\"1200px\" height=\"675px\" frameborder=\"0\" scrolling=\"yes\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/div><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8fbcb12 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8fbcb12\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-493db40\" data-id=\"493db40\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-846f7db elementor-widget elementor-widget-text-editor\" data-id=\"846f7db\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"text-decoration: underline;\">II. la diversit\u00e9 g\u00e9n\u00e9tique au sein d\u2019un clone repose sur les mutations<\/span><\/p><p>En l\u2019absence d\u2019\u00e9changes g\u00e9n\u00e9tiques avec l\u2019ext\u00e9rieur, la diversit\u00e9 g\u00e9n\u00e9tique dans un clone r\u00e9sulte de l\u2019accumulation de mutations successives dans les diff\u00e9rentes cellules. Des informations sur les mutations et leurs effets ph\u00e9notypiques, notamment sur un site r\u00e9gulateur de l\u2019expression d\u2019un g\u00e8ne est abord\u00e9 via le TP1 sur la Polydactylie<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-9cb9bc9\" data-id=\"9cb9bc9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5c41c60 elementor-widget elementor-widget-text-editor\" data-id=\"5c41c60\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div style=\"width: 100%;\"><div style=\"position: relative; padding-bottom: 56.25%; padding-top: 0; height: 0;\">\u00a0<\/div><\/div><p><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" src=\"https:\/\/view.genial.ly\/5da87e687aadeb0f69480d93\" width=\"1200px\" height=\"675px\" frameborder=\"0\" scrolling=\"yes\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9073cff elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9073cff\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-8f08617\" data-id=\"8f08617\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7fa0d43 elementor-widget elementor-widget-text-editor\" data-id=\"7fa0d43\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong><u>Chapitre II. Le brassage des g\u00e9nomes \u00e0 chaque g\u00e9n\u00e9ration : la reproduction sexu\u00e9e des eucaryotes<\/u><\/strong><\/p><p><strong>I. La g\u00e9n\u00e9tique mend\u00e9lienne<\/strong><\/p><p>Apr\u00e8s avoir abord\u00e9 les 3 lois de Mendel, nous traitons des brassage all\u00e9liques au travers de l&#8217;\u00e9tude d&#8217;un haplonte, Sordaria, champignon ascomyc\u00e8te (TP2).<\/p><p><strong>II. les brassages all\u00e9liques permis par la m\u00e9iose, \u00e9tudes de deux g\u00e8nes<\/strong><\/p><p>Cette premi\u00e8re approche exp\u00e9rimentale nous am\u00e8ne \u00e0 consid\u00e9rer la notion de brassage all\u00e9lique et \u00e0 complexifier son \u00e9tude au travers d&#8217;un diplonte, la drosophile. (TP3)<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-69fbcb9\" data-id=\"69fbcb9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-dd6ae11 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"dd6ae11\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-d91010e\" data-id=\"d91010e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4132b02 elementor-widget elementor-widget-text-editor\" data-id=\"4132b02\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>III. Analyse pr\u00e9dictive en m\u00e9decine <\/strong><\/p><p>Cf TP La mucoviscidose<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-24e846f\" data-id=\"24e846f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e75888d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e75888d\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-d1e615d\" data-id=\"d1e615d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fef9494 elementor-widget elementor-widget-text-editor\" data-id=\"fef9494\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Les accidents g\u00e9n\u00e9tiques au cours de la m\u00e9iose, sont abord\u00e9s au travers de l&#8217;\u00e9tude de la trisomie 21 et de l&#8217;\u00e9tude des familles multig\u00e9niques. <\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-9c8ffe7\" data-id=\"9c8ffe7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-358730c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"358730c\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-ab76094\" data-id=\"ab76094\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-46e5305 elementor-widget elementor-widget-text-editor\" data-id=\"46e5305\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>Th\u00e8me 1_A_3_L\u2019in\u00e9luctable \u00e9volution des g\u00e9nomes au sein des populations<\/strong><\/p><p><strong>I. La structure g\u00e9n\u00e9tique d\u2019une population est d\u00e9crite par le calcul des fr\u00e9quences g\u00e9notypiques et all\u00e9liques : le mod\u00e8le de Hardy-Weinberg<\/strong><\/p><p>\u00a0<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-8ba0d1c\" data-id=\"8ba0d1c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5a6438f elementor-widget elementor-widget-text-editor\" data-id=\"5a6438f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>Les fr\u00e9quences g\u00e9notypiques se d\u00e9duisent des fr\u00e9quences all\u00e9liques selon la relation\u00a0:<\/strong><\/p><p><strong>f<sub>AA<\/sub>= p<sup>2<\/sup>\u00a0\u00a0\u00a0\u00a0 f<sub>Aa<\/sub>= 2pq\u00a0\u00a0\u00a0\u00a0 f<sub>aa<\/sub> = q<sup>2<\/sup><\/strong><\/p><p><strong>avec p<sup>2<\/sup> + 2pq + q<sup>2<\/sup> = 1<\/strong><\/p><p><strong>et p + q = 1<\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-af94fe7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"af94fe7\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-ece687c\" data-id=\"ece687c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d505096 elementor-widget elementor-widget-text-editor\" data-id=\"d505096\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>IV. La notion d\u2019esp\u00e8ce au travers de l\u2019analyse des g\u00e9nomes<\/strong><\/p><p><em>Questionner la notion d\u2019esp\u00e8ce en s\u2019appuyant sur les apports modernes du s\u00e9quen\u00e7age de l\u2019ADN.<\/em><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-7e63993\" data-id=\"7e63993\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-69d6261 elementor-widget elementor-widget-text-editor\" data-id=\"69d6261\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div style=\"width: 100%;\"><div style=\"position: relative; padding-bottom: 56.25%; padding-top: 0; height: 0;\">\u00a0<\/div><\/div><p><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" src=\"https:\/\/view.genial.ly\/5dc4343b03986d0f382c24af\" width=\"1200px\" height=\"675px\" frameborder=\"0\" scrolling=\"yes\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Dans ce Th\u00e8me 1-A-G\u00e9n\u00e9tique et \u00e9volution, il s&#8217;agit d&#8217;un approfondissement des concepts de biodiversit\u00e9 et d&#8217;\u00e9volution. Ce th\u00e8me 1-A comprend 4 chapitres. Chapitre 1-A-1 L&#8217;origine du g\u00e9notype des individus. Chapitre I. La conservation des g\u00e9nomes : stabilit\u00e9 g\u00e9n\u00e9tique et \u00e9volution&hellip;&nbsp;<a href=\"https:\/\/svt-dalaine.fr\/svt\/theme-1-a-la-terre-la-vie-et-lorganisation-du-vivant-genetique-et-evolution\/\" class=\"more-link\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[57,59,58,56],"tags":[],"class_list":["post-1191","page","type-page","status-publish","hentry","category-spe_theme1","category-spe-1-a-1-genotype","category-spe-theme_1_a","category-spe_svt_tale_2020"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Th\u00e8me 1-A-La Terre, la vie et l&#039;organisation du vivant: G\u00e9n\u00e9tique et \u00e9volution - Bienvenue sur le site de Sciences de la Vie et de la Terre<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/svt-dalaine.fr\/svt\/theme-1-a-la-terre-la-vie-et-lorganisation-du-vivant-genetique-et-evolution\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Th\u00e8me 1-A-La Terre, la vie et l&#039;organisation du vivant: G\u00e9n\u00e9tique et \u00e9volution - Bienvenue sur le site de Sciences de la Vie et de la Terre\" \/>\n<meta property=\"og:description\" content=\"Dans ce Th\u00e8me 1-A-G\u00e9n\u00e9tique et \u00e9volution, il s&#8217;agit d&#8217;un approfondissement des concepts de biodiversit\u00e9 et d&#8217;\u00e9volution. Ce th\u00e8me 1-A comprend 4 chapitres. Chapitre 1-A-1 L&#8217;origine du g\u00e9notype des individus. Chapitre I. 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