By knowing which genes predispose people to particular conditions, doctors will be able to predict which people are likely to suffer from a particular disease and offer a preventive course of action, which may involve medical treatment or lifestyle changes. Furthermore, cures could be found for genetic diseases like cystic fibrosis or sickle cell anaemia. People could be diagnosed with illnesses that they are suspectible to develop in the future and spend their life worrying about it even before they get it.
