The term DNA Holder can be summarized as a GENE, which is a four letter word. A GENE is a unit of heredity that is passed from parent to offspring and is made up of DNA. DNA stands for deoxyribonucleic acid and is the molecule that carries genetic information in all living organisms. It is responsible for the development and functioning of an organism and is found in the nucleus of cells. Genes are the basic physical and functional units of heredity and are composed of DNA. They are responsible for the transmission of inherited traits from one generation to the next.