Well As I explained earlier in this thread, the DNA is like a language with an alphabet that has 4 different letters (A, T, G and C). Each letter and its root on the chromosome represents a nucleotid. Then, a chromosome is a run of zillions of nucleotids. On some places the run has a specific meaning (called a gene) and lets build a constitutive molecule of your body. But those significative parts (genes) are very tidy compared to the whole nucleotid run (chromosome) that makes a chromosome.
The rest of the run (the largest part) has no meaning so far.
I tried to sum it up as much as I could, hope that makes sense, does it?
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