The race is on to discover the genes that determine people's susceptibility to illness and disease. Billions of dollars are available in the new market for genetic testing but the human costs of such advances may outweigh the benefits.
Jane Corbin reports on the dangers of a "brave new world" where a genetic underclass may be denied insurance, health care and employment, and meets American families who have been identified as bad risk. Will insurance companies in Britain start to demand genetic tests?