Controlled mitosis and cancer Flashcards
Cancer is a result of…
uncontrolled mitosis.
Cancerous cells divide repeatedly…
and form a tumour, which is an irregular mass of cells.
Cancers start when changes…
occur in the gene that controls cell division.
Mutation is…
change in any gene.
An oncogene is a particular…
mutated gene that causes cancer.
Most mutated cells are…
either affected in some way or are destroyed by the body’s immune system.
Mutation usually has no harmful…
effect on the body, since most cells can be replaced.
Carcinogens are…
chemicals which affect genetic activity and cause cancer. E.g. soot, diesel exhaust.
Mutation in gene corrupts…
the coded genetic instructions for mitosis control.
Genetic causes of cancer…
are caused by genes inherited from parents.
Excess exposure to…
radiation can cause cancer.
Some viruses such as…
HPV and HIV- can cause cancer.
