How Big Is the Human Genome?

Our DNA is the chemical material which contains all of the information that our cells use to do their stuff. At each position there's one of four possibilities, they happen to start with letters A, G, C, and T. The totality of the DNA is called our genome, so that's just a word for all of the DNA. Each of us, in every cell in our body, we've got those six billion letters. So you can think of DNA as a long set of instructions written in an alphabet that has four letters,. Our English alphabet is 26 letters. And in total, we get three billion letters of DNA from our mother and 3 billion letters ofDNA from our father.