How Does DNA Know How to Build You
"DNA doesn't 'know' anything—it's a chemical code that cells read to build and maintain your body."Your DNA contains about 20,000 genes, each containing instructions for making a specific protein. Proteins are the building materials and tools of your body. The code uses only four letters—A, C, G, and T—and every three letters forms a code for one of 20 amino acids. But not every gene is active in every cell. Regulatory genes tell other genes when to turn on or off. HOX genes determine your body's overall structure—where your head goes, where your arms go. DNA doesn't know how to build you…
The skinny
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