Non-Coding Dna - GCSE Biology Definition

Non-coding DNA refers to the parts of an organism’s DNA that do not code for proteins. Although only a small portion of DNA contains instructions to make proteins, the majority is non-coding and plays other important roles. It helps regulate when and how genes are switched on or off, maintains chromosome structure, and protects the genome’s stability. You can think of non-coding DNA like the spaces and punctuation in a sentence—while it doesn’t carry direct instructions, it helps the cell interpret and manage genetic information correctly. Understanding non-coding DNA is important for learning how genetics and cell processes work.