Assume that the genes for tan body and bare wings are 15 map units apart on chromosome II in Drosophila. Assume also that a tan-bodied, bare-winged female was mated to a wild type male and the resulting F1 phenotypically wild type females were mated to tan-bodied, bare- winged males. Of 1000 offspring, what would be the expected phenotypes and in what numbers would they be expected?© BrainMass Inc. brainmass.com September 26, 2018, 8:40 am ad1c9bdddf - https://brainmass.com/biology/genetics/how-to-calculate-distance-between-gene-on-a-chromosome-134373
Number of recombinants is directly proportional to the distance between genes in map unit. This relationship is utilize in calculating the number of phenotypes.