Suppose that in Drosophila melanogaster, the allele for red eyes is dominant over the allele for purple eyes, and the allele for a grey body is dominant over the allele for a black body. Also suppose that a testcross was done to check for genetic linkage between the genes for these traits, with the following results for the offspring: 478 flies with red eyes and a black body
27 flies with red eyes and a grey body
462 flies with purple eyes and a grey body
33 flies with purple eyes and a black body
Which of the following best represents the map distance between the genes for these two traits?