Construct a chromosome map for genes a b c and d using the over data:A to D=25 percent; A to B=30 percent; C to D=15 percent; B to D=5 percent; B to C=20 percent

B-D-C-A.

Explanation:

The chromosome map helps to understand the location of genes in the genome map. The distance between the genes can be used to locate the genes of chromosome.

The distance between the Band D is 5%. The B and D gene can be located with each other. Then gene C is located after D and the distance between them is 15%. This will give the distance between B and C is 20%.  The gene A is located at the last position A and the distance between them 30%.

Thus, the correct answer is B-D-C-A.

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