In Drosophila the genes A B D are linked.  You cross a strain that is homozygous for d with a strain that is homozygous for ab.   Below are the phenotypes and progeny of a test cross.  Give the correct order of the genes in the chromosome and determine the map distances between genes. Phenotype       Number                                      ABd                  389      abD                  413      ABD                   60     abd                    68     aBd                    29     AbD                    34     Abd                      3     aBD                      4

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