8/22/20071“Mitosis and Meiosis”Cell structureHomologous chromosomes, ploidyMitosis and cell divisionCell cycle controlMeiosis and sexual reproductionSpermatogenesis and OogenesisSignificance of meiosisGenetic 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 tddi l idtito 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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8/22/20072Cell Structure and Genetic Material1.Eukaryotes (DNA)2.Prokaryotes (DNA)3.Viruses (DNA or RNA)We can’t see any of this stuff!Cell StructureEukaryotes = 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/EukaryotesEukaryota: Organisms with nucleated cells