The DNA sequence is the order of nucleotides in a DNA molecule. It is the most basic level of organization of genetic information in living things. The sequence determines the structure and function of all genes, as well as how they are expressed.
A gene is a section of DNA that codes for a specific protein. Proteins are the molecules that carry out most of the work in cells. They build, maintain, and run all the systems of our bodies. Genes make up about 2%