Use the Following Information to Answer the Questions Below

Multiple Choice

Use the following information to answer the questions below.
Drosophila (fruit flies) usually have long wings (+) but mutations in two different genes can result in bent wings (bt) or vestigial wings (vg) .
-If flies that are heterozygous for both the bent wing gene and the vestigial wing gene are mated, what is the probability of offspring with bent wings only?

A) 1/8
B) 3/8
C) 1/4
D) 9/16
E) 3/16