Topic 1 - Cell Biology

• During the cell cycle the genetic material is doubled and then

  divided into two identical cells.

  Before a cell can divide it needs to grow and increase the number of sub-cellular structures such as ribosomes and mitochondria. The DNA replicates to form two copies of each chromosome.

  In mitosis one set of chromosomes is pulled to each end of the cell

  and the nucleus divides.

  Finally the cytoplasm and cell membranes divide to form two

  identical cells.

  Cell division by mitosis is important in the growth and development

  of multicellular organisms.

  Cell cycle