Gene expression can be regulated by changes in structure. In

Gene expression can be regulated by changes in structure. In the fly eye, the gene White is required for eye color. Even if a wild type White gene is present and all the DNA sequences required to express White are present, color development can be suppressed by gene expression regulation. Provide two examples of how a change in molecular structure could alter White gene expression. One change must alter transcription of the White gene. The other must involve post-transcriptional regulation of White. Neither scenario can change the DNA encoding the White gene. In both cases provide a description of the chromatin at the White gene, the transcriptional activity at White, and the accumulation of white transcripts.
实在不能解答的童鞋,麻烦告诉告诉我什么是post-transcriptional regulation和transcription of the White gene.