Suppose that in studies of genes on the same chromosome you find the following recombination frequencies: 
Figure 13.2
Why is the total distance between a and b less than the distance between a and c plus the distance between c and b ?
A) a and b are not linked
B) the distances were calculated incorrectly
C) b is in between genes a and c
D) double crossovers between a and b decrease recombinants
E) all three genes encode the same trait
Correct Answer:
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