what is gene expression essay
Definition of Gene Expression. A gene is a small piece of genetic material written in a code and called DNA. Each gene has within it a set of instructions for making molecules that organisms need to survive. Genes themselves cannot be used by an organism.
Specifically, gene expression is controlled on two levels. First, transcription is controlled by limiting the amount of mRNA that is produced from a particular gene. The second level of control is through post-transcriptional events that regulate the translation of mRNA into proteins.
The relationship between the genes and the characters can be summarized as: Genome to phenome concept. It is evident that cells use RNA to make proteins. Hence gene expression involves two steps: transcription (RNA making) and translation (Protein making). In the first step (transcription) the coded message present in the DNA as the nucleotide sequence is passed on to the mDNA (messenger RNA).