Developmental analysis of two mutations affecting chemotactic behavior in Drosophila melanogaster.

InDrosophila melanogaster, gusA^Q1, a cold-sensitive mutation, affects the behavior of larvae and adults tested with quinine sulfate. The temperature-sensitive period ofgusA^Q1 occurs during embryogenesis. Another cold-sensitive mutation,gusE^N13, alters the response of adults to quinine sulfate without affecting larval behavior. The temperature-sensitive period of this mutation is during the third larval instar.