- A gene is…
Stretch of deoxyribonucleic acid (DNA) or ribonucleic acid (RNA) that constitutes a single hereditary informational unit. Normally, genes contain the blueprint for an organism's physical characteristics that e.g. determine what the organism will look like. The blueprint is encoded in a chemical four-letter code. In a strictly regulated way, this code is translated into a protein via the intermediate step RNA.