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Front Page | Sci/Tech | Decoding Humanity
Decoding Humanity
  From DNA to a human
  The race for the human genome
  How scientists decode DNA
 FROM DNA TO A HUMAN
From DNA to human
  Back to Intro  
1. The four letters

All genetic code is spelled out with just four chemical letters, or bases: adenine (A), thymine (T), cytosine (C) and guanine (G). These pair up, A with T and C with G. The human genome has between 2.8 and 3.5 billion base pairs.

Click on the stages to learn how DNA makes a human
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