Phenotype # of progeny
+++ 75
++c 348
+bc 96
a++ 110
ab+ 306
abc 65
Total= 1,000
Map the 3 gene-gene distances and make a genetic map.
I was taught to compare the parental types (most common) to the double crossovers (least common) to find the gene order (abc/bac/acb). How do you find the gene order when there are no double crossovers?