{"id":73356,"date":"2018-03-09T23:18:15","date_gmt":"2018-03-09T23:18:15","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/cromosomas-sexuales-gigantes-de-microtus-cabreraeanalisis-molecular-de-su-composicion-estructura-y-evolucion\/"},"modified":"2018-03-09T23:18:15","modified_gmt":"2018-03-09T23:18:15","slug":"cromosomas-sexuales-gigantes-de-microtus-cabreraeanalisis-molecular-de-su-composicion-estructura-y-evolucion","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/cromosomas-sexuales-gigantes-de-microtus-cabreraeanalisis-molecular-de-su-composicion-estructura-y-evolucion\/","title":{"rendered":"Cromosomas sexuales gigantes de microtus cabrerae:an\u00e1lisis molecular de su composici\u00f3n, estructura y evoluci\u00f3n."},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Marchal Ortega  Juan  Alberto <\/strong><\/h2>\n<p>Introducci\u00f3n  la determinaci\u00f3n del sexo en la especie microtus cabrerae presenta unas caracter\u00edsticas que hacen de ella un interesante modelo para estudiar la estructura, composici\u00f3n y evoluci\u00f3n de los cromosomas sexuales y los mecanismos de determinaci\u00f3n del sexo en mam\u00edferos.  los cromosomas x e y de esta especie son especialmente grandes debido a la presencia de grandes bloque de heterocromatina constitutiva. Los cromosomas sexuales de m. Cabrerae no aparean durante la profase i de la meiosis, siendo por tanto asin\u00e1pticos. El gen determinante de test\u00edculo sry tiene en esta especie una distribuci\u00f3n \u00fanica dado que se localiza en el cromosoma y, como es normal en la mayor\u00eda de los mam\u00edferos, y en el cromosoma x, estando presente en las hembras siendo m. Cabrerae la \u00fanica especie en la que esto ha sido descrito.  objetivos  hemos estudiado la composici\u00f3n y organizaci\u00f3n de los cromosomas sexuales gigantes de m. Cabrerae mediante t\u00e9cnicas citogen\u00e9tica y moleculares. Los objetivos propuestos son los siguientes:  1. Estudiar secuencias repetidas de los bloques heterocrom\u00e1ticos de los cromosomas x e y en m. Cabrerae.  2. Analizar el origen y la evoluci\u00f3n de los cromosomas sexuales gigantes in especies de microtus.  3. Estudiar la localizaci\u00f3n cromos\u00f3mica,  la organizaci\u00f3n, la secuencia y el origen de las copias m\u00faltiples del gen sry presentes en machos y hembras de la especie m. Cabrerae.  m\u00e9todos  para realizar este trabajo hemos empleado t\u00e9cnicas citogen\u00e9ticas (preparaciones cromos\u00f3micas, bandas c, fish y \u00abchromosome painting\u00bb) y moleculares (extracci\u00f3n de adn gen\u00f3mico y plasm\u00eddico, aislamiento de adn repetido mediante restricciones, amplificaciones por pcr, clonado y secuenciaci\u00f3n de adn, marcaje de sondas y southern blot).  resultados y discusi\u00f3n  1. Secuencias repetidas de los cromosomas sexuales de m. Cabrerae  hemos caracterizado tres tipos de secuencias repetidas de estos cromosomas: ms<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Cromosomas sexuales gigantes de microtus cabrerae:an\u00e1lisis molecular de su composici\u00f3n, estructura y evoluci\u00f3n.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Cromosomas sexuales gigantes de microtus cabrerae:an\u00e1lisis molecular de su composici\u00f3n, estructura y evoluci\u00f3n. <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Marchal Ortega  Juan  Alberto <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Ja\u00e9n<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 30\/03\/2005<\/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>Antonio Sanchez Baca<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Juan  ramon Lacadena  calero <\/li>\n<li>Juan  Luis Santos coloma (vocal)<\/li>\n<li>Alberto Redi carlo (vocal)<\/li>\n<li>Rafael Diaz de la guardia guerrero (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Marchal Ortega Juan Alberto Introducci\u00f3n la determinaci\u00f3n del sexo en la especie microtus cabrerae presenta unas caracter\u00edsticas [&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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