In a series of twopoint map crosses involving five genes loc

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-vg 20 vg-b 5 vg-c 30 adp-c 5 adp-b 40 adp-pr 15 pr-c 10 pr-b 25 c-b 35 If the adp gene is present near the end of chromosome II match the relative position of the other genes. closest to adp second closest to adp third closest to adp furthest from adp pr b c vg

Solution

Total number of progeny = 20 + 5 + 30 + 5 + 40 + 15 + 10 + 25 + 35 = 185

Frequency of adp gene = 55 / 185 = 0.29

Frequency of b gene = 5 + 40 +25 + 35 = 0.56

Frequency of c gene = 5 + 30 + 10 + 35 = 80 / 185 = 0.43

Frequency of Vg gene = 20 + 5 +30 = 55 / 185 = 0.29

Frequency of Pr gene = 20 + 15 + 10 + 25 = 70 / 185 = 0.37

Closest to Adp gene is Vg gene.

Second closest gene to Adp gene is Pr gene.

Third closest gene to Adp gene is gene c.

Farthest gene to Adp gene is gene b.

The order of genes is Vg, Pr, c and b genes. The order of options D, A, C and B.