Mitosis  meiosisautumnhannah
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Mitosis meiosisautumnhannah

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Mitosis  meiosisautumnhannah Mitosis meiosisautumnhannah Presentation Transcript

  • By: Hannah Hastings & Autumn Crosby
  • Interphase
    • Both cycles go through Interphase
    • Gap one- DNA prepares for replicating
    • Synthesis- Replicates to produce two sets of identical DNA.
    • Gap two- Cell growth and prepares for organelles.
    This is Mitosis interphase
  • Mitosis This shows the Mitosis process
  • Mitosis
    • A process that takes place in the nucleus to divide a cell into two daughter cells with the same chromosomes and DNA. Mitosis involves four main phases: prophase, metaphase, anaphase, and Telophase.
  • Prophase
    • Prophase has three stages.
    • Early Prophase: The DNA and proteins condense and become visible. Centrioles begin to move apart, and the nuclear envelop starts to disappear.
    • Middle Prophase: The process keeps continuing, and everything keeps moving.
    • Late Prophase: Centrioles go to opposite poles of the nucleus. Microtubules (spindle fibers) begin to form. Chromosomes are put in homologous pairs, and the nuclear envelope is gone.
    This shows Mitosis Prophase
  • Metaphase
    • The homologous pairs are held together by a centromere.
    • Kinetochores allow spindle fibers to attach to the centromere
      • Kinetochores- a complex system of fibers that can be duplicated when the chromosomes divide into chromatids.
      • The spindle fibers push and pull the homologous pairs to the metaphase plate located in the middle of the cell.
    This shows Mitosis Metaphase
  • Anaphase
    • The centromeres split and chromosomes move to the different sides of the cell.
    • Centrioles and spindle fibers help the chromosomes move.
    • The beginning of Cytokinesis.
    This shows Mitosis Anaphase
  • Cytokenisis
    • Cytoplasm divides
    • Separation of nuclei into daughter cells.
  • Cytokenisis & Telophase This shows Mitosis Cytokenisis and Telophase
  • Telophase
    • The nuclear envelope begins to reappear.
    • The Chromosome lines disappear.
    • Cell plate begins to form due to Cytokinesis.
  • Meiosis 1 This is the Meiosis 1 process
  • Meiosis 1
    • The type of nuclear division associated with sexual reproduction, producing four haploid cells from a single diploid cell, a process involving two cycles of division. It has been divided into the same cycles as Mitosis.
  • Prophase
    • Prophase in Mitosis and Prophase in Meiosis are different.
    • It contains Synapsis, Tetrad, and Crossing-over.
    • Synapsis: the pairing of homologous chromosomes
    • Tetrad: the four haploid cells produced by one complete meiotic division
    • Crossing-over: the exchange of genetic information producing a new gene.
    This is Meiosis 1 Prophase
  • Metaphase
    • Metaphase is the same, but in mitosis, there are two homologous pairs, and in meiosis there are four.
    This picture shows Meiosis 1 Metaphase
  • Anaphase
    • Anaphase is different in Meiosis then Mitosis because in Meiosis the sister chromatids stay together, and in Mitosis they separate.
    This picture is of Meiosis 1 Anaphase
  • Telophase
    • Everything in Telophase is the same as in Mitosis.
    This picture shows Meiosis 1 Telophase
  • Meiosis 2 The process of meiosis 2
  • Meiosis 2
    • Does not have Interphase
    • At the end of meiosis 2 there are four separate cells.
    • They have half the number of chromosomes that a cell has in Mitosis.
  • Works Cited
    • Mrs.Baas’s biology book
    • All of the pictures came right off of google!
    • Class notes
    • Dictionary.com