Mitosis meiosisautumnhannah


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Mitosis meiosisautumnhannah

  1. 1. By: Hannah Hastings & Autumn Crosby
  2. 2. Interphase <ul><li>Both cycles go through Interphase </li></ul><ul><li>Gap one- DNA prepares for replicating </li></ul><ul><li>Synthesis- Replicates to produce two sets of identical DNA. </li></ul><ul><li>Gap two- Cell growth and prepares for organelles. </li></ul>This is Mitosis interphase
  3. 3. Mitosis This shows the Mitosis process
  4. 4. Mitosis <ul><li>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. </li></ul>
  5. 5. Prophase <ul><li>Prophase has three stages. </li></ul><ul><li>Early Prophase: The DNA and proteins condense and become visible. Centrioles begin to move apart, and the nuclear envelop starts to disappear. </li></ul><ul><li>Middle Prophase: The process keeps continuing, and everything keeps moving. </li></ul><ul><li>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. </li></ul>This shows Mitosis Prophase
  6. 6. Metaphase <ul><li>The homologous pairs are held together by a centromere. </li></ul><ul><li>Kinetochores allow spindle fibers to attach to the centromere </li></ul><ul><ul><li>Kinetochores- a complex system of fibers that can be duplicated when the chromosomes divide into chromatids. </li></ul></ul><ul><ul><li>The spindle fibers push and pull the homologous pairs to the metaphase plate located in the middle of the cell. </li></ul></ul>This shows Mitosis Metaphase
  7. 7. Anaphase <ul><li>The centromeres split and chromosomes move to the different sides of the cell. </li></ul><ul><li>Centrioles and spindle fibers help the chromosomes move. </li></ul><ul><li>The beginning of Cytokinesis. </li></ul>This shows Mitosis Anaphase
  8. 8. Cytokenisis <ul><li>Cytoplasm divides </li></ul><ul><li>Separation of nuclei into daughter cells. </li></ul>
  9. 9. Cytokenisis & Telophase This shows Mitosis Cytokenisis and Telophase
  10. 10. Telophase <ul><li>The nuclear envelope begins to reappear. </li></ul><ul><li>The Chromosome lines disappear. </li></ul><ul><li>Cell plate begins to form due to Cytokinesis. </li></ul>
  11. 11. Meiosis 1 This is the Meiosis 1 process
  12. 12. Meiosis 1 <ul><li>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. </li></ul>
  13. 13. Prophase <ul><li>Prophase in Mitosis and Prophase in Meiosis are different. </li></ul><ul><li>It contains Synapsis, Tetrad, and Crossing-over. </li></ul><ul><li>Synapsis: the pairing of homologous chromosomes </li></ul><ul><li>Tetrad: the four haploid cells produced by one complete meiotic division </li></ul><ul><li>Crossing-over: the exchange of genetic information producing a new gene. </li></ul>This is Meiosis 1 Prophase
  14. 14. Metaphase <ul><li>Metaphase is the same, but in mitosis, there are two homologous pairs, and in meiosis there are four. </li></ul>This picture shows Meiosis 1 Metaphase
  15. 15. Anaphase <ul><li>Anaphase is different in Meiosis then Mitosis because in Meiosis the sister chromatids stay together, and in Mitosis they separate. </li></ul>This picture is of Meiosis 1 Anaphase
  16. 16. Telophase <ul><li>Everything in Telophase is the same as in Mitosis. </li></ul>This picture shows Meiosis 1 Telophase
  17. 17. Meiosis 2 The process of meiosis 2
  18. 18. Meiosis 2 <ul><li>Does not have Interphase </li></ul><ul><li>At the end of meiosis 2 there are four separate cells. </li></ul><ul><li>They have half the number of chromosomes that a cell has in Mitosis. </li></ul>
  19. 19. Works Cited <ul><li>Mrs.Baas’s biology book </li></ul><ul><li>All of the pictures came right off of google! </li></ul><ul><li>Class notes </li></ul><ul><li> </li></ul>