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Although you could screen for certain hereditary diseases, genome sequencing (even if cheap and with perfect results) won’t be a reliable way of screening customers for health insurance companies. There are just too many other factors that affect overall health more than your genes, i.e. lifestyle choices and diet. So I doubt cheaper and better genome mapping techniques will affect the health insurance industry much.
On a side (irrelevant) note, the human genome project used samples from a large number of donors – this is not a problem since the margin for error is greater than the individual variation in the genome.
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