Which of the following would be the most likely event if Ubx were expressed in the second thoracic segment in Drosophila?
A) The fly would develop a new set of forewings on the second segment.
B) The fly would develop a larger set of forewings on the second segment.
C) The fly would develop a set of halteres on the second segment.
D) The fly would develop eyes on the second segment.
E) Nothing would happen because wings do not develop from the second segment.

Question

Quizplus · Accepted Answer

Ubx is a gene that represses wing development in the posterior segments of Drosophila. If Ubx were expressed in the second thoracic segment, which is normally a wing-bearing segment, it would likely lead to a transformation of the segment into a haltere-bearing segment. Halteres are small knob-like structures that are used for balance during flight, and they are normally found in the posterior segments of Drosophila. Therefore, choice C is the most likely event to occur if Ubx were expressed in the second thoracic segment.

Which of the Following Would Be the Most Likely Event