The Following Groups of Mutants Developed from Mutations in Genes

Multiple Choice

The following groups of mutants developed from mutations in genes active during the development of Drosophila. Based on the characteristics of the mutants, which group resulted from mutations in the earliest-acting gene?

A) Mutants with half the normal number of body segments
B) Mutants in which cells that would normally become epidermal cells developed into nerve cells
C) Mutants that have kinky bristles instead of the long, curled bristles of normal flies
D) Mutants without body segments
E) Mutants with tail structures at both ends