Question

Which of the following two genes are closest on a genetic map of Drosophila?

1) b and vg
2) cn and b
3) vg and cn
4) b and rb
5) rb and cn

Answer 1

The genes b and vg are closest on a genetic map of Drosophila. The correct option is 1.

Step-by-step explanation:

The two genes that are closest on a genetic map of Drosophila are b and vg. The map distances between these genes are not provided in the given information, so we cannot determine the exact distance between them. However, based on the information provided in the linkage map, we can conclude that b and vg are physically closer to each other than any of the other gene pairs listed. Hence, 1 is the correct option.