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: pr−adp 29 pr−vg 13 pr−c 21 pr−b 6 adp−b 35 adp−c 8 adp−vg 16 vg−b 19 vg−c 8 c−b 27If the adp gene is present near the end of chromosome II (locus 83), construct a map of these genes