Question: You’ve isolated a collection of X-linked, recessive lethal mutations of Drosophila. Such mutation…

You’ve isolated a collection of X-linked, recessive lethal
mutations of Drosophila. Such mutations are lethal when
homozygous or hemizygous. You examine the polytene chromosomes of
your mutants and recognize that four of them contain deletions
(deficiencies) of defined portions of the X chromosome. You name
these deletion mutations Df1, Df2, Df3, Df4.

In your misc. collection of Drosophila strains, you
have nine X-linked recessive mutations that affect various aspects
of the fly’s phenotype (wing shape, eye color, bristle morphology,
etc.). You know that these mutations are located on the X
chromosome, because they show sex-linked inheritance. These nine
mutations are named v1through v9, where v stands
for “visible phenotype.”

You cross each of the four deletion-containing strains with each
of the nine visible-containing strains and test whether the
deletions “uncover” the visible allele (i.e. whether the recessive
visible alleles exhibit pseudodominance among the progeny). Your
data are shown in the table; in each case, a “+” indicates that the
Df/vheterozygote is normal. A number indicates that the
heterozygote exhibits the phenotype of the visible allele.

What is the order of the genes that are represented by visible
mutant strains v1, v2, v3, v5, v6, v7 and v8?
(i.e. all except v4 and v9)