Biology

In fruit flies, the genes for body color (B: gray, b: black) and wing shape (V: normal, v: vestigial) are located on the same chromosome. A Punnett square shows the results of a test cross between a heterozygous fly (BbVv) and a homozygous recessive fly (bbvv):

If no crossing-over occurs, what proportion of the offspring will have the parental phenotype (gray body, normal wings or black body, vestigial wings)?