definition of gene expression
Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product.These products are often proteins, but in non-protein coding genes such as transfer RNA (tRNA) or small nuclear RNA (snRNA) genes, the product is a functional RNA.he process of gene expression is used by all known life-eukaryotes (including multicellular organisms), prokaryotes (bacteria and archaea), and utilized by viruses-to generate the macromolecular machinery for life.