Cellcycle

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Cellcycle

  1. 2. Introduction <ul><li>The cell cycle is necessary for all multi-cellular organisms. There are different parts, including interphase, mitosis, and cytokinesis. Mitosis consists of prophase, metaphase, anaphase, and telophase. At first, the cell grows and develops. The chromosomes, towards the end of interphase, become visible. They line up along the center of the cell and are attached to spindle fibers. The chromosomes split and are pulled to opposite sides of the cell. They began to cluster and make two new cells. In cytokinesis, two daughter cells form. </li></ul>
  2. 3. What you need to know <ul><li>What chromosomes are </li></ul><ul><ul><li>A structure made of DNA and protein in the nucleus of a eukaryotic cell </li></ul></ul><ul><li>What mitosis is </li></ul><ul><ul><li>The process of cell division where the nucleus divides into two nuclei </li></ul></ul><ul><li>What cell division is </li></ul><ul><ul><li>The process of one cell dividing into two daughter cells </li></ul></ul>
  3. 4. http://www.ba-education.com/dna/mitosis.jpg A picture of all the phases...
  4. 5. Interphase <ul><li>The cell grows and develops. </li></ul><ul><li>Towards the end of this phase, the DNA (with the chromosomes) double. </li></ul><ul><li>Longest part of cell cycle </li></ul>
  5. 6. Prophase <ul><li>The chromosomes are visible. </li></ul><ul><li>The nuclear membrane disappears. </li></ul><ul><li>Nucleolus vanishes. </li></ul>
  6. 7. Metaphase <ul><li>The chromosomes line up across the center. </li></ul><ul><li>Spindle fibers attach to the center of the chromosome. </li></ul>
  7. 8. Anaphase <ul><li>Chromosomes split away from each other. </li></ul><ul><li>Each half is pulled to opposite sides of the cell. </li></ul><ul><li>Cell is splitting a bit. </li></ul>
  8. 9. Telophase <ul><li>Chromosomes cluster in the center of each new cell. </li></ul><ul><li>Nuclear membrane begins to form. </li></ul><ul><li>Cells began separating. </li></ul>
  9. 10. Cytokinesis <ul><li>Cytoplasm divides. </li></ul><ul><li>Two daughter cells form. </li></ul><ul><li>It has the same number of chromosomes as the parent cell. </li></ul><ul><li>Each cell starts interphase in the endless cycle. </li></ul>
  10. 11. Extra Places for Information <ul><li>http://www.dmacc.edu/instructors/mitosis.ht </li></ul><ul><li>http://www.stanford.edu/group/Urchin/mitosis.htm (animation of mitosis) </li></ul><ul><li>http://www.johnkyrk.com/mitosis.html </li></ul><ul><li>http://www.biologycorner.com/bio1/cellcycle.html </li></ul>
  11. 12. Quiz <ul><li>Q. 1 What happens in prophase? </li></ul><ul><li>Q. 2 In which phase do the spindle fibers attach to the center of each chromosome? </li></ul><ul><li>Q.3 What is the last phase in the cycle? (the phase in which the cells completely split) </li></ul><ul><li>Q. 4 What is the longest part of the cell cycle? </li></ul>
  12. 13. Quiz Answers <ul><li>A. 1 Chromosomes are visible, the nuclear membrane and nucleolus vanish. </li></ul><ul><li>A. 2 Metaphase </li></ul><ul><li>A. 3 Cytokinesis </li></ul><ul><li>A. 4 Interphase </li></ul>
  13. 14. Conclusion (A brief summary) <ul><li>The cell cycle is the period of time from the beginning of one cell division to the next. There are three phases of the cell cycle is interphase, mitosis, and cytokinesis. Mitosis is divided into four phases, prophase, metaphase, anaphase, and telophase. In interphase, the cell grows. In mitosis, the nucleus divides. By the end of cytokinesis, two daughter cells form, and interphase starts again.  </li></ul>

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