Genes are a specific sequences of DNA located on the chromosomes.
Chromosomes consist of proteins (histones) combined with two complementary chains of DNA.
Two chromosome strands are arranged in a spiral known as the double helix.
A gene can be described as a linear piece of DNA that includes:
- a regulatory sequence that determines when the gene will be transcribed
- an initiation sequence
- exons that are the coding region
- introns that are non coding regions and are spliced out of the gene during transcription
- a termination sequence