What genes are Genes are coded massages that tell cells how to make proteins, proteins are the molecules that control the way cells behave. Our genes decide what we look like and how our body works. Genes are made of DNA and grouped togather to make chromosomes, they are in the nucleus of the cell. The nucleus is the cell's control centre. How the cell become cancerous Cancerous cells are different from the normal cells, they have faults or mutation in several of there genes which make them divide too often and form a tumor. The genes that are damaged might be: • Genes that encourage the cell to multiple ( know as oncogenes) • Genes that stop the cell multiplying ( tumour suppressor gene) • Genes that r...