Hox genes in fruit fly embryo. Each color represents a section of body development controlled by a different set of genes. These are the reason why your foot doesn't grow out of the middle of your face, and why your eyes aren't in the back of your head.
Extract Your DNA: Ever wish you could see the strands of genetic material that make you. You can, and there's no fancy lab equipment required. In this NOVA video short, learn how to extract your own DNA using just a few common household items.