Gene mapping is the process by which we determine what the position is of the genes along any given chromosome. Now part of gene mapping involves determining what the order is of the genes along the chromosome. But to determine what the order of the genes is, we have to determine, we have to know what the percent of recombination is between each pair of gene along along that chromosome. So to demonstrate how we can use the percent recombination between each gene pair to calculate or to determine what the gene order is, let's take a look at the following example. So let's suppose on a given chromosome we have three different genes. Gene A given in red, gene B given in purple and gene C given in blue.