Finding out the location of a gene on a chromosome is an important criterion for a sequencing project involving mapping studies. Accurately locating the genes on a chromosome helps to assign its function and adds value in linking them with each other. Thus we can find out whether the genes are present on the same chromosome. The relative position of the genes helps to construct a map and use it for analysis. A well-constructed map speeds up the genome sequencing task. A genome map, whether physical or genetic, is a guide that shows the position of the genes and their distinctive features. Just like a route map guides us throughout the road, a genome map guides in locating the genes and the possible changes in their composition. Knowing the genes and their function gives an estimate of the disease associated with the same. The chances of the relative errors are high without a map, especially when the DNA contains a repetitive sequence. The linkage groups showing the relative position of known genes associates the inheritance of two or more non-allelic genes.