The second stunner was how much human genetic material -- more than 90 percent -- is made up of what scientists were calling "junk DNA." The term was coined to describe similar but not completely identical repetitive sequences of nucleotides (the same substances that make genes), which appeared to have no function or purpose. The main theory at the time was that these apparently non-working sections of DNA were just evolutionary leftovers, much like our earlobes.
But if biophysicist Andras Pellionisz is correct, genetic science may be on the verge of yielding its third -- and by far biggest -- surprise...
...Rather than being useless evolutionary debris, he says, the mysteriously repetitive but not identical strands of genetic material are in reality building instructions organized in a special type of pattern known as a fractal. Its this pattern of fractal instructions, he says, that tells genes what they must do in order to form living tissue, everything from the wings of a fly to the entire body of a full-grown human.
Another way to describe the idea: The genes we know about today, Pellionisz says, can be thought of as something similar to machines that make bricks (proteins, in the case of genes), with certain junk-DNA sections providing a blueprint for the different ways those proteins are assembled.
http://www.sfgate.com/cgi-bin/article.cgi?file=/gate/archive/2002/11/21/jnkdna.DTL
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