Cancer

• A checkpoint checks if cell is large enough and if DNA is copied properly.
• Cancer occurs when checkpoints fail and mutations to cell DNA arnt detected. Some mutations cause cell to skip G0 resting phase and start the cell cycle again.
• A cell will do cell limbo or apoptopsis if it detects a problem.
• If cells interfere with surrounding cells: malignant.
• If cells don't interfere with surrounding cells: benign.
• Cancer is caused by carcinogens in the environment which are external factors that affect a cells ability to control how often it divides and damage DNA.
• Cancer cells usually have an unsual number of chromosomes due to incomplete mitosis or cytokinesis. They also have an abnormal shape.
• Cells can lose attachment to nearby tissue and cause problems at other areas which is called metastasis.