In fruit flies, one gene called fruitless is responsible for male courtship behavior. The gene is transcribed in both males and females, but due to differences in intron usage, is only translated as a full-length protein in males. A genetic XX female will attempt to court other females if she expresses the male form of the fruitless gene. What molecular process would have to be accurately executed to assure that the male form of the gene is expressed only in males?