Mitosis

Question 1

significance of mitosis

Answer 1

• mitosis produces daughter cells that are
  genetically identical to the parent cell which
  gives genetic stability
  - mitosis allows damaged cells to be replaced
  by genetically identical ones
  - mitosis allows a tissue to increase its size
  with new genetically identical cells

Question 2

Tumour suppressor genes

Answer 2

• control the cell cycle
• if damaged, cells fail to divide, divided too often,
  or at the wrong time
• mutation could affect the timing of the cell cycle
• act as a brake and prevent the cell cycle from
  repeating continually
  - prevent rapid replication that would
  lead to a tumour formation

Question 3

Proto-oncogenes

Answer 3

genes that have the potential to cause cancer if mutated

Question 4

oncogenes

Answer 4

genes that have been mutated and can cause cancer.