In Drosophila melanogaster the allele for long wings is dominant over the allele for vestigial wings,

Question

and the allele for a gray body is dominant over the allele for a black body. A testcross was done to
check for genetic linkage between the genes for these traits, with the following results for the
offspring:410
flies with long wings and a black body
105 flies with long wings and a gray body
390 flies with vestigial wings and a gray body
95 flies with vestigial wings and a black body
Which of the choices below best represents the map distance between the genes for these two traits?

Answer 1

A