Fruit fly genes with recessive mutаnt аlleles fоr blаck bоdy cоlor (b) and down-curved wings (dc) occur on the same chromosome. An F1 dihybrid was produced by crossing a gray-bodied, normal-winged fly homozygous for both wild type alleles (b+ b+dc+ dc+) with a black-bodied, curved-wing fly homozygous for both mutant alleles (b b dc dc). A resulting F1 dihybrid, with a gray body and normal wings, was then crossed to another fly homozygous for both mutant alleles. For progeny of the second cross, the following phenotypic data were collected:Flies with gray body and down-curved wings: 117Flies with gray body and normal wings: 336Flies with black body and normal wings: 126Flies with black body and down-curved wings: 321Based on this data, what is the genetic distance between these two genes?