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By: Maryn S. Introduction Cell division and reproduction Mitosis when the nucleus of a eukaryotic cell divides. Replacing worn out cells and producing offspring identical to parent Meiosis The division of a cell and its nucleus that produces haploid daughter cells Ensures fertilization with proper chromosome numbers Interphase G1 S cell carries out normal functions does not reproduce chromosomes inside the cell replicate (sister chormatids) Sister chormatids are held together near the middle of the centromere ensures replication of cells by cell division are identical G2 cell continues to grow organelles replicate Mitosis (start of the Mitotic stage) when the nucleus of a eukaryotic cell divides. Importance of Mitosis replacing old, wore out, or dead cells reproducing offspring identical to the parent (asexual reproduction) Phases of Mitosis Prophase Metaphase Anaphase Telophase Prophase The first step in Mitosis Major events the replicated chromosomes of DNA coil tightly together the membrane around the nucleus breaks apart allowing the chromosomes to move to freely around the cell Metaphase The second phase of Mitosis Major events Hair-like fibers move replicated chromosomes to the middle of the cell replicated sister chromatids align at the middle of the cell Anaphase The Third phase of Mitosis Major events Hairlike fibers attach to the sister chromatids of every replicated chromosomes Fibers pull and separate replicated chromatids to opposite ends of the cell chromatids begin being called chromosomes Telophase The fourth phase of Mitosis Major events A new membrane forms around each set of chromosomes Coiled chromosomes begin to unwind There are two new chromosomes that are identical to the original one The cell has not yet divided Cytokinesis The final phase of cell division Major events The cytoplasm and its components divide into two identical daughter cells (jello) Cell Pictures of Mitosis Meiosis The division of a cell and its nucleus that produces haploid daughter cells Importances It ensures the common chromosme inheritance numbers Ensures fertilization with proper number of chromosomes Sexual Reproduction (Meiosis) The production of an offspring that results when the genetic materials from two different cells combine. Advantages Genetic variation Selective breeding Disadvantages Difficulties of sperm and egg fertilization Time spent to grow and develop to be able to reproduce Asexual Reproduction(Mitosis) The production of offspring by one parent without a sperm and an egg joining Advantages Does not require a mate Less time input for more reproduction Identical offspring is well developed for the same environment (cloning) Disadvantages Lack of genetic variation Genetic mutations that pass through generations Conclusion Cell division and reproduction Mitosis when the nucleus of a eukaryotic cell divides. Replacing worn out cells and producing offspring identical to parent Meiosis The division of a cell and its nucleus that produces haploid daughter cells Ensures fertilization with proper chromosome numbers In both ways of reproduction there is still the foundation of the process cell division. Thank You!!! Bibliography http://botit.botany.wisc.edu/images/130/Meiosis/Lilium_microsp orogenesis/Meiosis_1.low.jpg http://wwwdelivery.superstock.com/WI/223/1436/PreviewCom p/SuperStock_1436R-196024.jpg http://dogtime.com/system/gallery_pictures/26/large/GoldenRetriever-puppy-3-picture.jpg http://research.nmsu.edu/molbio/bioinfo/tutorials/clip_art/imag es/mitosis.jpg http://upload.wikimedia.org/wikipedia/commons/7/7b/MajorE ventsInMeiosis.jpg National Geographic, Focus on Life Science; McGraw Hill, 2007
