chapter 2 - 8/22/2007 1 Mitosis and Meiosis Cell structure...

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Unformatted text preview: 8/22/2007 1 Mitosis and Meiosis Cell structure Homologous chromosomes, ploidy Mitosis and cell division Mitosis and cell division Cell cycle control Meiosis and sexual reproduction Spermatogenesis and Oogenesis Significance of meiosis Genetic continuity between cells and organisms of any sexually reproducing species is maintained by the processes of mitosis and meiosis. The processes are orderly and efficient, serving to produce diploid somatic cells and haploid gametes, respectively. It is during these division stages that the genetic material is condensed into discrete, visible structures called chromosomes. Quote of the chapter!! The most exciting phrase to hear in science, the one that heralds new discoveries is not 'Eureka!' but discoveries, is not Eureka! but That's funny..... Isaac Asimov 8/22/2007 2 Cell Structure and Genetic Material 1. Eukaryotes (DNA) 2. Prokaryotes (DNA) 3. Viruses (DNA or RNA) We cant see any of this stuff! Cell Structure Eukaryotes = Higher organisms, having true nuclei and membranous organelles whose cells demonstrate mitosis and meiosis. Usually multi- cellular and having a more complex life cycle than prokaryotes. http://tolweb.org/Eukaryotes Eukaryota: Organisms with nucleated cells 8/22/2007 3 Eukaryotic generalized cell structure Eukaryotes The term "eukaryote" comes from the Greek and means "true nucleus." Eukaryotic cells have a double membrane (the nuclear membrane ) membrane (the nuclear membrane ) surrounding the nucleus. Prokaryotes- Organisms lacing a nuclear membrane, whose cells do not demonstrate mitosis and meiosis. Usually uni-cellular and having a less complex life cycle than eukaryotes....
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This note was uploaded on 02/20/2008 for the course SORC 330 taught by Professor Brick during the Spring '08 term at Colorado State.

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chapter 2 - 8/22/2007 1 Mitosis and Meiosis Cell structure...

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