Within 30 years, humans could be debating whether to take charge of their own evolution. The average life span in the developed world will be 90, diseases will be diagnosed before symptoms appear, many humans will already be genetically modified and patients with heart diseases, cancer or dangerous infections will be treated with prescriptions tailored to their own genetic makeup, according to Francis Collins, one of the leaders of the project to sequence the entire human genome. By 2010, Collins told in a major international biotechnology forum in France this week, there could be predictive tests for at least 12 hereditary conditions, and scientists would understand the role that genes played in most common diseases. Embryoes developed by in vitro fertilization methods would be routinely scanned for genetic illnesses. Legislation to prevent genetic discrimination—the creation of an underclass denied health care, employment or insurance because of this genetic knowledge—could be in place within 10 years. By 2020, the designer drugs based on research on the human genome will be coming on to the market. The pharmaceutical industry would have produced powerful treatments for diabetes, hypertension, heart disease and schizophrenia. By 2030, if all went well, there should be comprehensive health care based on genetic knowledge, with individual medicine based on individual risk. Doctors would understand better the links between genes and environmental factors. Illnesses would be detected much earlier by molecular surveillance, even before symptoms appeared, and therapies would be more effective and more available. Collins also foresaw that by 2030, people would be arguing, as British physicist Stephen Hawking already is, that humans could start to take charge of their own evolution by altering their genes to improve the species. The passage mainly deal with______.