Sesion 11 Mitosis

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Education

Published on May 20, 2009

Author: rilev

Source: slideshare.net

MITOSIS Blgo. Ricardo León V.

Blgo. Ricardo Leon V. - rilev2002@hotmail.com MITOSIS – DEFINICION • División celular • Duplica numero de cromosomas • Obtiene 2 células diploides (2n) • Solo en células somáticas

Blgo. Ricardo Leon V. - rilev2002@hotmail.com FASES • Mitosis  División celular • Interfase

Blgo. Ricardo Leon V. - rilev2002@hotmail.com Fases de la Interfase •G1 – Crecimiento •S – Sintesis •G2 – Preparacion para la division

Blgo. Ricardo Leon V. - rilev2002@hotmail.com CROMOSOMAS

Blgo. Ricardo Leon V. - rilev2002@hotmail.com CROMOSOMAS

Blgo. Ricardo Leon V. - rilev2002@hotmail.com MITOSIS - FASES • PROFASE • METAFASE • ANAFASE • TELOFASE

Blgo. Ricardo Leon V. - rilev2002@hotmail.com PROFASE

Blgo. Ricardo Leon V. - rilev2002@hotmail.com METAFASE • Los cromosomas se colocan en el ecuador

Blgo. Ricardo Leon V. - rilev2002@hotmail.com ANAFASE • Los cromosomas se separan

Blgo. Ricardo Leon V. - rilev2002@hotmail.com TELOFASE • Los cromosomas se agrupan en los extremos del huso acromatico

Blgo. Ricardo Leon V. - rilev2002@hotmail.com MEIOSIS - DEFINICION • Division celular • Se obtienen 4 celulas (n) • Solo en celulas gametos

Blgo. Ricardo Leon V. - rilev2002@hotmail.com Fases • Meiosis I –Reduccional ▫ Profase I ▫ Metafase I ▫ Anafase I ▫ Telofase I • Meiosis II - Ecuacional ▫ Profase II ▫ Metafase II ▫ Anafase II ▫ Telofase II

Blgo. Ricardo Leon V. - rilev2002@hotmail.com

Blgo. Ricardo Leon V. - rilev2002@hotmail.com Profase I Cromossomas em processo Cromossomas de condensação... A condensação Aproximam-se, aumenta. aindadescon- densados. ... emparelham, estabelecendo Início do Leptóteno sinapses. Paquíteno Zigóteno Cromatídios Esta troca é... imãos já são visí- Cromosso - quiasmas veis. mas se man - tém presos Os quiasmas desfazem-se. Cromatidios homólogas nos pontos trocam de troca. pedaços. Estes pon- ...denominada tos são os Tétrade permutação ou quiasmas. “crossing-over”. Cada par parece ter Paquíteno 4 cromossomas e é Diplóteno Diacinese tardio denominado tétrade.

Blgo. Ricardo Leon V. - rilev2002@hotmail.com

Blgo. Ricardo Leon V. - rilev2002@hotmail.com

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