Figure 12.1 shows a map of four genes on a chromosome. Figure 12.1
Between which two genes would you expect the highest frequency of recombination?
A) A and W
B) W and E
C) E and G
D) A and E
E) A and G

Question

Figure 12.1 shows a map of four genes on a chromosome.  Figure 12.1
Between which two genes would you expect the highest frequency of recombination?
A) A and W 
B) W and E 
C) E and G 
D) A and E 
E) A and G

Quizplus · Accepted Answer

The distance between two genes on a chromosome is inversely proportional to the frequency of recombination between them. In this case, the genes A and G are farthest apart from each other, so they are expected to have the highest frequency of recombination between them. Therefore, the answer is choice E.

Figure 121 Shows a Map of Four Genes on a Chromosome