Answer from: Douglas Lester, PhD, MSc, BSc (Hons)
The sequence of a gene lettering is like a small piece of unique computer software. Depending on the sequence of letters and your gene, this will determine both the shape and quantity of a particular structural or functional protein in particular cells in the human body.
Genes - what is their function?
Genes are a set of instructions that determine the human appearance, health, and behaviour. They are made of DNA that is deoxyribonucleic acid and provide instructions for the organism to create proteins.