Even with a full DNA scan, SNPs (single nucleotide polymorphisms - one letter mutations) are mostly still what they'll be looking at. The difference is that ins

Even with a full DNA scan, SNPs (single nucleotide polymorphisms - one letter mutations) are mostly still what they'll be looking at. The difference is that instead of probing the genome for a million or so specifically predetermined SNPs (most of which are hardly well-understood), now you'll have every single base identified, which means that when some new important SNP is discovered, you (probably) won't have to get retested - you just pull out the old data.