Uncontrolled cell division

• What is a mutation?


  A random change in a gene
• What is controlled by the chemical instructions in an organism's DNA?

  The rate at which cells divide by mitosis
• What happens if there is a change in one of the genes that controls cell division?

  The cell may start dividing uncontrollably, and can result in a mass of abnormal cells called a tumour.
• What is cancer?

  If the tumour invades and destroys surrounding tissue.
• How do you calculate growth in plants?

  The height, leaf surface area, mass and percentage change
• What is the equation to calculate percentage change?

  Final value - starting value / starting value x 100