Final answer:
In the Zonosemata fly experiment, the control group is the group of Zonosemata flies with unaltered wings, which is used to establish a baseline for comparing other experimental groups.
Step-by-step explanation:
The group that serves as a control group in the Zonosemata fly experiment would be the Zonosemata flies with unaltered wings. This group is essential for establishing a baseline result against which the other experimental groups can be compared.
The typical practice in an experiment is to have a control that experiences no intentional treatment, thereby displaying the natural state of the subject under study. This allows scientists to isolate the effects of the treatment by comparing groups that received the treatment with the one that did not. Since all other groups had some form of alteration to their wings, the Zonosemata flies with unaltered wings would be the most suitable control group.