| − | A '''Physical map''' is a chromosome map of a species that shows the specific physical locations of its [[gene]]s and/or markers on each chromosome. Physical maps are particularly important when searching for disease genes by positional cloning strategies and for [[DNA]] sequencing. | + | A '''physical map''' is a chromosome map of a species that shows the specific physical locations of its [[gene]]s and/or markers on each chromosome. Physical maps are particularly important when searching for disease genes by positional cloning strategies and for [[DNA]] sequencing. |