Gene Expression - GCSE Biology Definition

Gene expression is the process by which information from a gene is used by a cell to make a specific protein. Think of it like a recipe in a cookbook - the gene contains the instructions that tell the cell how to create proteins, which are important molecules that perform various functions in the body. When a gene is expressed, it means the cell is "reading" the instructions to produce the protein. This is crucial because proteins help control important activities, like growth and repairing tissues. Gene expression can be turned on or off depending on what the cell or organism needs at any given time.