[iang]

True, but there's also the fact we don't know the whole human genome - only about 98% of it.

[onemoreact]

We have the raw data on the actual DNA for several people which is what you need to make a copy. What we don't know is what the data means and what all the mutations are in the wild. Which is what you want to know if we are going to start making changes.

[iang]

Actually we don't have the full DNA sequence for any human. For example, if you look at the data from say the Genome Reference Consortium the first 10,000 bases on Chromosome are designated as N - unknown.