The following eukaryotic structural gene contains two introns and three exons. exon 1 intron 1 exon 2 The table below shows four possible mRNA products of this gene. Use the labels to explain what may have caused each mRNA. Drag the correct label to each location in the table. Labels may be used once, more than once, or not at all. no mutation in any splicing signal sequence mutation in the gene's promoter sequence mutation in a splicing signal sequence in intron 1 mutation in a splicing signal sequence in intron mutations in splicing signal sequences in both intron 1 and intron 2 1. 3. exon 1 2. No mRNA produced 4. exon 1 exon 2 exon 1 Mature mRNA intron 1 exon 2 intron 2 exon 2 exon 3 exon 3 intron 2 intron 2 exon 3 exon 3 Explanation