In a series of two-point map crosses involving five genes located on chromosome II in Drosophila, the following recombinant (single-crossover) frequencies were observed:
adp-vg 29
pr-vg 13
vg-c 6
adp-c 35
adp-pr 16
pr-c 19
pr-b 8
c-b 27
If the adp gene is present near the end of chromosome II match the relative position of the other genes.