The Source Code
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Every person has a set of chromosomes, or coiled strands of DNA. Check out this HowStuffWorks podcast to learn how chromosomes combine to promote variation from one generation to the next.
If it was possible to take a full scan of all of the DNA of every cell in and on your body the results would be startling: Only 1 percent would be human. The other 99 percent comprises all of the bacteria, fungi, viruses and other microbes you literally cannot live without.