It is the process through which stored information in the DNA is used to produce proteins, that function according to that information.
It is an important process as it determines which gene needs to be expressed more than others at different sites in the organism.
Gene expression occurs in the nucleus and occurs through transcription and translation.
It is controlled at the site of transcription, a process where the DNA from a gene is copied into an RNA called the messenger RNA (mRNA).
Gene expression in an organism depends on its external as well as the internal environment, molecules in the cell, metabolism, and mutations at different sites in the DNA.
