Chapter 14, Problem 21P

The eyes of Drosophila develop from imaginal discs, groups of cells set aside in the fly embryo that differentiate into the adult structures during the pupal stage. Despite their importance in nature, eyes are dispensable for fruit $\text{-}$ fly life in the laboratory.

Devise a genetic screen to identify genes directing development of the fly eye.

What complications might arise from genetic screens targeting an organ that differentiates late in development?