{"id":71259,"date":"2018-03-09T23:15:50","date_gmt":"2018-03-09T23:15:50","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/analisis-del-apareamiento-meiotico-durante-la-profase-de-la-primera-division-en-ecotipos-normales-y-mutantes-meioticos-de-arabidopsis-thaliana\/"},"modified":"2018-03-09T23:15:50","modified_gmt":"2018-03-09T23:15:50","slug":"analisis-del-apareamiento-meiotico-durante-la-profase-de-la-primera-division-en-ecotipos-normales-y-mutantes-meioticos-de-arabidopsis-thaliana","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/analisis-del-apareamiento-meiotico-durante-la-profase-de-la-primera-division-en-ecotipos-normales-y-mutantes-meioticos-de-arabidopsis-thaliana\/","title":{"rendered":"Analisis del apareamiento meiotico durante la profase de la primera division en ecotipos normales y mutantes meioticos de arabidopsis thaliana"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Martin Carnes Jos\u00e9 Javier <\/strong><\/h2>\n<p>En el presente trabajo se ha utilizado la t\u00e9cnica de hibridaci\u00f3n in situ de fluorescencia (fish) para analizar la evoluci\u00f3n en la asociaci\u00f3n de distintas regiones cromos\u00f3micas a lo largo de la profase temprana de la primera divisi\u00f3n mei\u00f3tica en arabidopsis thaliana. Se emplearon sondas correspondientes a distintos tipos de secuencias, como la secuencia repetida pal1b, que constituye la gran mayor\u00eda de la cromatina centrom\u00e9rica, la secuencia repetida par21, que se localiza en la heterocromatina pericentrom\u00e9rica, la sonda pat2512 correspondiente a la secuencia de un trna que se encuentra en el brazo corto del cromosoma i, y el bac f19k16 que se corresponde con una secuencia distal del brazo corto del cromosoma i.  contrariamente a lo indicado por otros autores, se comprob\u00f3 que la cromatina no sufre ning\u00fan tipo de reorganizaci\u00f3n en c\u00e9lulas en interfase premei\u00f3tica y en leptotena, permaneciendo con una disposici\u00f3n similar a la encontrada en c\u00e9lulas som\u00e1ticas. Es en cigotena temprana cuando se produce un cambio en la distribuci\u00f3n de la cromatina en el interior del n\u00facleo que conduce al agrupamiento de las regiones centrom\u00e9ricas, y que lleva adem\u00e1s aparejada la asociaci\u00f3n hom\u00f3loga de esas regiones, al menos en el cromosoma i. As\u00ed mismo se ha observado que el proceso de asociaci\u00f3n hom\u00f3loga tiene lugar en dos etapas claramente diferenciadas. En la primera, se observa un incremento brusco en los niveles de asociaci\u00f3n hom\u00f3loga en las regiones pericentrom\u00e9ricas y distales analizadas. Posteriormente, hay un avance m\u00e1s suave en todas las regiones analizadas hasta conseguir la plena asociaci\u00f3n. En esta segunda etapa se ha observado una clara dependencia entre las regiones centrom\u00e9ricas e insterticiales.  el an\u00e1lisis de c\u00e9lulas en diplotena y metafase i con las sondas espec\u00edficas anteriormente se\u00f1aladas ha revelado que la distribuci\u00f3n de quiasmas es uniforme tanto a lo largo del brazo corto del cromsoma i como entre<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Analisis del apareamiento meiotico durante la profase de la primera division en ecotipos normales y mutantes meioticos de arabidopsis thaliana<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Analisis del apareamiento meiotico durante la profase de la primera division en ecotipos normales y mutantes meioticos de arabidopsis thaliana <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Martin Carnes Jos\u00e9 Javier <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 16\/11\/2004<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Juan Orellana Saavedra<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 M\u00aa Carrillo becerril <\/li>\n<li>ramon Giraldez ceballosescalera (vocal)<\/li>\n<li>Juan  ramon Lacadena  calero (vocal)<\/li>\n<li>Jos\u00e9 Luis Bella sombria (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Martin Carnes Jos\u00e9 Javier En el presente trabajo se ha utilizado la t\u00e9cnica de hibridaci\u00f3n in situ [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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