Gene mapping involves using genetic maps to find links between genes and diseases transmitted from parents to children, and has been useful in locating genes believed to cause common disorders such as asthma, heart disease, diabetes, cancer, and psychiatric conditions. Researchers use linkage to determine chromosome regions likely containing risk genes, ruling out low-chance areas, and then use association studies on candidate genes to test for connections to conditions. It is hoped that gene mapping can help find cures and prevent diseases from becoming prominent.