Create a mutant fly with any number of variations and mate it with a wild-type fly. How many offspring are wild-type? What are the
phenotypes of the flies that are not wild-type?

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

trachea, alveoli, lung capillaries, arteries