mitosis

• chromosomes

  coiled up lengths of DNA molecules
• genes

  carried by chromosomes. control the development of characteristics
• how many chromosomes do body cells contain?

  two of each chromosome
• stage 1

  -cell grows and increases mitochondria and ribosomes

  -DNA replicates to form two copies of each chromosome

  -DNA forms x-shaped chromosomes
• stage 2-mitosis

  -chromosomes line up at the centre of the cell and cell fibres pull them apart. arms go to opposite ends of the cell

  -membranes form around the chromosomes to form the nuclei of the new cell

  -cytoplasm and membrane divides

  -two identical daughter cells