A fruit fly with the genotype b + b + vg + vg has a gray body and normal wings. This fly is crossed with a mutant fly that has black body and vestigial wings, bbvgvg. The genes for body color and wing structure are linked, that is, they are located on the same chromosome, so they were unexpected to be inherited together. However, several recombinant phenotypes were observed with combinations of traits not seen in the parents, such as gray bodies with vestigial wings, or black bodies with normal wings, How did this happen?