The process of identifying the location of specific genes on their chromosomes or deoxyribonucleic (DNA) molecules. Gene mapping uses complex scientific procedures and follows precise methodologies. Gene mapping can be specific for certain traits or diseases, such as Alzheimer’s disease or Parkinson’s disease. It can also be broad-based and general, as in the human genome project to identify and locate all the genes in the human body. Gene mapping is essential for understanding the genetic, or hereditary, connections of various diseases and perhaps eventual gene therapies to correct genetic mutations.