Context: This passage describes the wing type trait in fruit flies:
Some scientists breed fruit flies to learn how traits are inherited. These scientists often use flies with vestigial wings, which are shorter and stubbier than normal wings. Fruit flies with vestigial wings cannot fly, so they are easier for scientists to handle and study.
In a group of fruit flies, some individuals have normal wings and others have vestigial wings. In this group, the gene for the wing type trait has two alleles. The allele for vestigial wings (n) is recessive to the allele for normal wings (N).
This Punnett square shows a cross between two fruit flies.
What is the expected ratio of offspring with vestigial wings to offspring with normal wings? Choose the most likely ratio.
A. 1:3
B. 4:0
C. 3:1
D. 2:2
E. 0:4
Pick the correct answer from the listed options and provide the letter of the selected option.
Answer: D