Cell Division

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  • Cell Division
    • the nucleus of a cell contains chromosomes made of DNA molecules, each of which carries a large numbers of genes.
      • In body cells, the chromosomes are normally found in pairs.
        • Human body cells contain 23 pairs.
    • an analogy to help understand the structure:
      • Book is like the chromosomes
        • page is like the genes
          • paper is like the material that makes up the gene and the chromosomes
    • in the cell cycle , sub cellular structures duplicate
      • the chromosomes duplicate
        • cells increase in size
          • chromosomes move and cell divides
            • cycle repeats
    • DNA must occur before cell division so that when the chromosomes split in two, each new cell has the same amount of DNA as the original cell
      • this means that the daughter cells are genetically identical to the parent cell

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