Deoxyribonucleic acid Is the non abbreviated word for DNA. The DNA is a chain of nucleotides carrying the script for each individuals geneteics, it can determine appearance and reproduction as well as viruses. DNA is in every living organism and it makes the difference about the way you look appearance wise and the 1% of your appearance that differs you from immediate family memebers. Humans have 23 pairs of chromosomes (thread like material carrying genetic information) half of the chromosomes come from the male parent and half from the female. The offspring is determined biologically a boy or girl based on how many X or Y chromosomes they may have. Girls have two X chromosomes, whereas boys have an X and a Y chromosome. As apparent as it is, your DNA structure determines who you will be, with health or sickness or other individuatlties, it is important to note that all DNA is different, for very a very diverse world of people.