In 1953 the science of Biology was greatly expanded when James Watson and Francis Crick unveiled their model of a chemical structure that forms the blueprint of every living organism and called it DNA (Deoxyribonucleic acid).
DNA is the material that carries genetic information inside of our cells.
How the body translates that genetic information, depends on how the DNA is organized (more about this later). The genetic code was broken and because scientists now better understood this, many discoveries followed.