Your DNA contains a unique set of instructions that provide the information to build you. At the DNA level, all humans are 99.9% identical. Each person’s unique identity comes from the 0.1%, or one one thousandth, of our DNA that is different. Most everyone has heard that every person inherits half of their DNA from each parent. Importantly, what we inherit is these DNA differences. And in fact this is why children tend to resemble their parents.