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CELL GROWTH AND DIVISION

CELL GROWTH AND DIVISION. How did I grow taller ? How are my worn out cells replaced ? How do I heal from injuries ? The answer is…. Cellular Reproduction or Mitosis. Cells go through cycles during their lifetime.

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CELL GROWTH AND DIVISION

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  1. CELL GROWTH AND DIVISION

  2. How did I grow taller? • How are my worn out cells replaced? • How do I heal from injuries? The answer is….Cellular Reproduction or Mitosis

  3. Cells go through cycles during their lifetime. • Cells spend MOST of their time in a stage of growth and development calledInterphase THE CELL CYCLE:

  4. Interphase Cells grow in size and number of organelles. This is the Growth and Development stage. Chromosome Replication Cell Reproduction (Mitosis) Prepare for cell reproduction (Mitosis)

  5. 1. Type of cell division when chromosomes are duplicated and then separate into two identical and complete sets to be passed to each of the two daughter cells. For example in humans, body cells have 46 chromosomes. After mitosis, each of the two new identical daughter cells will have 46 chromosomes. 2. In this type of cell division, the hereditary information is identical in all the cells that result. Mitosis

  6. 3. Responsible for growth, maintenance and repair. 4. In some one-celled organisms, asexualreproduction is achieved through mitosis. 5. Cancersare a result of abnormal cell division.

  7. 1. Responsible for producing eggand sperm 2. The resulting daughter cells contain one-half the hereditary information. For example, in humans, each sperm or egg would contain 23chromosomes. Meiosis

  8. Cell membrane: Controls what enters and leaves the cell Nuclear membrane: Controls what enters and leaves the nucleus Chromosomes: Contains the DNA Centromere: Holds the Chromosomes together Centriols: Pulls the chromosomes apart Key words

  9. During interphase chromosomes are copied (the number doubles). Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosomeand its copy change to sister chromatidsat the end of this phase. CELL CYCLE:

  10. During Prophase, nuclear membrane breaks apart. Centrioles begin to move to opposite ends of the cell. Spindle fibers form between the centrioles (at the poles of the cell). MITOSIS BEGINS: Prophase

  11. During Metaphase chromosomes line up at the middle of the celland attach to the spindle fibers. Metaphase

  12. During Anaphase chromosomes are separated and are pulled to the opposite sidesof the cell. Anaphase

  13. During Telophase, nuclear membrane reforms around two sets of chromosomes. MITOSIS ENDS Telophase

  14. Final stage of the cell cycle is Cytokinesis, or the splitting of two cells. Each new identical cell has its own nucleus with identical chromosomes.

  15. In animal cells, the cell membrane moves inward and pinches together.

  16. In plant cells, a cell plate forms from the center outward until a cell wall is made.

  17. Number of chromosomes in each of the two resulting daughter cells is the same as the amount of chromosomes in the original parent cell. • For example: In fruit flies the parent cell has 8 chromosomes. After mitosis, each new daughter cell has 8 chromosomes. RESULT OF A MITOSIS DIVISION:

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