| − | {{stub}}A section of [[DNA]] that codes for the production of a [[protein]] or a portion of a protein. The gene is the fundamental unit of heredity. | + | {{stub}}A section of [[DNA]] that codes for the production of an [[RNA]] molecule. In most cases that RNA molecule codes for the production of a [[protein]], but in some cases (most notably the transfer RNA ([[tRNA]]) and ribosomal RNA ([[rRNA]]) genes) the RNA molecule is the end product. |