UHN: Clinics & Services All humans are incredibly alike. only 0.2% genetic differences. (in the average zebra herd there is @ a 25% difference). "Did you know all human beings are 99.8% the same? Human genetics is an area of science and medicine that describes how traits are inherited (passed down from one family member to another). The human genome is the complete set of coded instructions that are needed to make a person. These instructions are encoded in deoxyribonucleic acid (DNA). Our DNA is coiled into structures called chromosomes. Sections of DNA along each chromosome are referred to as genes. Each gene codes for one specific instruction to help our bodies to grow and develop." celebrate our common humanity & viva le difference!