Mitosis

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  • Mitosis
    • Mitosis makes new cells for growth and repair.
      • Body cells normally have two copies of each Chromosome
        • one from the organisms "mother" and one from its "father"
        • Therefore humans have 2 copies of chromosome 1 and 2 copies of chromosome 2
      • A human has 23 pairs of Chromosomes
      • when a body cell divides it needs to make new cells identical to the original cell
        • with the same number of chromosomes
    • Within a cell that is not dividing the DNA is all spread out in long strings
      • if the cell gets the signal to divide then the DNA needs to duplicate
        • so there is a copy for the new cell
        • The DNA is coppied and forms X-shaped chromosomes
          • Each "arm" of the chromosome is an exact duplicate of the other
        • The chromosomes then line up at the center of the cell and cell fibers pull them apart
          • The 2 arms of each chromosome goes to opposite ends of the cell
          • membranes form around each of the sets of chromosomes
            • These become the nuclei of the 2 new cells
            • Lastly the cytoplasm divides
    • Asexual also uses mitosis
      • Some organisms reproduce by mitosis
        • e.g strawberry plants form runners in this way, which become new plants
        • This is an example of asexual reproduction
          • The offspring have exactly the same genes as the parents
            • There is no variation

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