A human gene is having three exons and two introns. The length of the exon is 456, 224, and 524 bp. The length of the introns is 2.3 kb and 4.6 kb.
The following diagram shows the gene with promoter, introns, exons, start, and stop codons.
The transcript would be processed by alternative splicing that result in mRNAs that are partially identical to about 224 base-pairs. This is the exact length of the second exon, which proves that this part of the exon is common, for both the mRNA molecules. Also the 2.3 kb sequence of the intron is a part of the second transcript that was not a part of the first.
The intron that is found first is also a part of the second transcript, which is of 2524 nucleotides length.