The term DNA stands for Deoxyribonucleic acid. It has a double helix structure and is made up of nucleotides. The structure of DNA resembles a ladder, the oblique lines connecting the strands of DNA are the covalent bonds between its components. It carries the genetic materials of organisms from one generation to the next.
A DNA sample of a person can be obtained from his or her hair-roots, saliva or blood. Any cell of that person’s body can be used to extract his or her DNA sample. Mostly, the DNA is extracted from the cells or tissues of a person and further diagnosed under laboratory conditions to obtain a proper DNA profile.