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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.

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Presentation on theme: "By: Maryn S.. Introduction  Cell division and reproduction  Mitosis when the nucleus of a eukaryotic cell divides. Replacing worn out cells and producing."— Presentation transcript:

1 By: Maryn S.

2 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

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4 Interphase  G1  cell carries out normal functions  does not reproduce  S  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

5 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)

6 Phases of Mitosis  Prophase  Metaphase  Anaphase  Telophase

7 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

8 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

9 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

10 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

11 Cytokinesis  The final phase of cell division  Major events  The cytoplasm and its components divide into two identical daughter cells

12 (jello) Cell Pictures of Mitosis

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14 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

15 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

16 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

17 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.

18 Thank You!!!

19 Bibliography  http://botit.botany.wisc.edu/images/130/Meiosis/Lilium_microsp orogenesis/Meiosis_1.low.jpg 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://wwwdelivery.superstock.com/WI/223/1436/PreviewCom p/SuperStock_1436R-196024.jpg  http://dogtime.com/system/gallery_pictures/26/large/Golden- Retriever-puppy-3-picture.jpg http://dogtime.com/system/gallery_pictures/26/large/Golden- Retriever-puppy-3-picture.jpg  http://research.nmsu.edu/molbio/bioinfo/tutorials/clip_art/imag es/mitosis.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 http://upload.wikimedia.org/wikipedia/commons/7/7b/MajorE ventsInMeiosis.jpg  National Geographic, Focus on Life Science; McGraw Hill, 2007


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