Explain why it is more accurate to measure short rather than long map distances. Solution linkage map refers to a map of genes on a chromosomes based on linkage analysis.Linkage maps shows the relative position of a gene on the chromosome rather than their physical distances.It shows the relative position of a gene as determined by how often the genes are inherited together. Closer the genes more are chances of them being inherited together. Linkage maps are more accurate when the distance between the genes is shorter this is mainly because the chances of multiple cross overs becomes less to the close proximity of the genes , whereas in genes that have larger distances between them there are multiple cross overs and hence it becomes less accurate..