Complete  linkage  produces  only  parental
   chromosomes and phenotypes in the F[2].

   All F[1] flies are heterozygous for both loci and exhibit dominant red
   eyes and thin veins.
<LI> Crossing the F[1] should yield a 1:2:1 ratio in the F[2].
<LI> Testcross   with  homozygous  recessive  should  also  yield  only
parental phenotypes.