Suppose that a gene has three exons and two introns in the following order:
5ʹ exon 1 - intron 1 - exon 2 - intron 2 - exon 3 3ʹ
Which of the following could not result from alternative splicing in this gene?
A) 5ʹ exon 1 - exon 2 - exon 3 3ʹ
B) 5ʹ exon 2 - exon 3 3ʹ
C) 5ʹ exon 2 - exon 1 3ʹ
D) 5ʹ exon 1 - exon 3 3ʹ

Question

Quizplus · Accepted Answer

Exon 2 cannot directly splice to exon 1 as it is separated by intron 1. Therefore, 5ʹ exon 2 - exon 1 3ʹ cannot result from alternative splicing in this gene.

Suppose That a Gene Has Three Exons and Two Introns