dna

DNA, or deoxyribonucleic acid, is a molecule that carries the genetic instructions needed for the growth, development, and functioning of living organisms. It is found mainly inside the nucleus of cells and has a unique double-helix structure that looks like a twisted ladder. DNA contains four chemical bases: adenine, thymine, cytosine, and guanine. These bases form specific pairs that help store genetic information. DNA is passed from parents to their children, which explains why family members often share similar characteristics. It influences many features, such as eye color, hair type, and other inherited traits. Scientists study DNA to understand inherited diseases, explore human ancestry, and learn more about how living organisms work. DNA research is also important in medicine, biology, and forensic science.