A geneticist crossed two diploid fruit flies that were heterozygous for two autosomal genes, G G\,G and HHH. Both parents had the genotype GgHhGgHhGgHh.
The offspring from this cross showed only three genotypes in the following ratio:
1 GGhh:2 GgHh:1 ggHH 1\ \text{GGhh} : 2\ \text{GgHh} : 1\ \text{ggHH} 1 GGhh:2 GgHh:1 ggHHThe diagram below shows four possible arrangements of alleles on the chromosomes of the parent fruit flies.
Which panel correctly represents the arrangement of alleles on the chromosomes of these parent flies, assuming no crossing over occurred?
Panel W
Panel X
Panel Y
Panel Z
