When cancer starts to grow within a cell, this cell’s function is altered and it begins to multiply out of control. Simply put, cancer cells are nothing but cells gone wrong - they no longer respond to the signals that control cellular growth and death. Subsequently, they divide more rapidly than their progenitors and become less dependent on signals from other cells.
Explanation: Without gene duplication, mutation of genes would not exist. This would prevent organisms from adapting to their environment, making survival much more difficult if not impossible.
