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chapter 2 - "Mitosis and Meiosis Cell structure Homologous...

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8/22/2007 1 “Mitosis and Meiosis” Cell structure Homologous chromosomes, ploidy 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 t d di l id ti 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
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8/22/2007 2 Cell Structure and Genetic Material 1. Eukaryotes (DNA) 2. Prokaryotes (DNA) 3. Viruses (DNA or RNA) We can’t 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
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