A Strain of Drosophila Known as Dunce Produces One-Half the Amount

Essay

A strain of Drosophila known as dunce produces one-half the amount of cAMP phosphodiesterase found in wild-type flies,which causes a learning defect.Another strain of Drosophila known as rutabaga produces a defective adenylyl cyclase protein (one of the AC types expressed in most cells)and also causes a learning defect.A dunce-rutabaga double mutant fly has relatively normal learning.Explain these curious observations.