Chapter 13 Continued

Chapter 13 Continued - Chapter 13 Continued Comparison of...

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Chapter 13 Continued Comparison of Mitosis and Meosis Mitosis Prophase- chromosome duplication, duplicated chromosome( two sister chromatids) Meiosis Prophase I – homologous chromosome pairs held together by chiasma and sister chromatid cohesion, with chiasma (site of crossing over) Mitosis Metaphase- individual chromosomes line up at the metaphase plate Meiosis Metaphase I-Pairs of homologous chromosomes line up at the metaphase plate Mitosis Anaphase, Telophase- sister chromatids separate during anaphase Meiosis Anaphase,telophase- homologs separate during anaphase I: sister chromatids remain attached at centromere (two daughter cells) Meisosis II - sister chromatids separate during anaphase II 4 daughter cells of meiosis II Summary: Mitosis DNA Replication - Occurs during interphase before mitosis begins Number of divisions - One, including prophase,prometaphase,metaphase,anaphase, and telophase Synapsis of homologous chromosomes - none Number of daughter cells and genetic composition - two each diploid (2n) and genetically identical to the parent cell Role - enable multicellular adult to arise from zygote, produces cells for growth, repair, and in some species, asexual production Meiosis DNA Replication- occurs during interphase before meiosis I begins Number of divisions- two each including all the phases Synapsis of homologous chromosomes- occurs during prophase I alson with crossing over between non sister chromatids; resulting chiasmata hold pairs together due to sister chromatid cohesion
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Number of daughter cells and genetic composition- four, each haploid containing half as many chromsomes as the parent cell; genetically different from the parent cell and from each other Role: produces gametes reduces number of chromosomes sets by half and introduces genetic variablitiy among the gametes Meiosis unique 1. synapsis and crossing over - during prophase I duplicated homologs pair upl and the formation of the synaptonemal complex between them holds them in synapsis. Crossing over also occurs during prophase I. Synapsis and crossing over normally do not occur during prophase of mitosis
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This note was uploaded on 12/06/2011 for the course BIOL 1201 taught by Professor Wishtichusen during the Fall '07 term at LSU.

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Chapter 13 Continued - Chapter 13 Continued Comparison of...

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