NEET BIOLOGY

Detailed explanation-1: -Cancer cells have gene mutations that turn the cell from a normal cell into a cancer cell. These gene mutations may be inherited, develop over time as we get older and genes wear out, or develop if we are around something that damages our genes, like cigarette smoke, alcohol or ultraviolet (UV) radiation from the sun.

Detailed explanation-2: -All cancers begin when one or more genes in a cell mutate. A mutation is a change. It creates an abnormal protein.

Detailed explanation-3: -DNA repair genes are involved in fixing damaged DNA. Cells with mutations in these genes tend to develop additional mutations in other genes and changes in their chromosomes, such as duplications and deletions of chromosome parts. Together, these mutations may cause the cells to become cancerous.

Detailed explanation-4: -Most types of cancer are believed to begin with a random genetic mutation that makes a normal cell go horribly awry. This is followed by mutations, which endow the cancer cells with properties allowing them to grow without normal controls to become a tumor.

Detailed explanation-5: -Oncogenes are mutated genes that cause cells to grow out of control and can lead to cancer. Proto-oncogenes are normal genes that control cell growth but if they become mutated they can turn into oncogenes.