This figure shows one wild type (in upper left corner) and 5 locomotion defect worms. As you can see, the moving patten of mutants is different from wild type. This is to show how locomotion defect can affect worms’ motion.
A segment of DNA that is transcribed, but removed from within the transcript (i.e., mRNA) by splicing together the sequences (exons) on either side of it. Genes V, p.1245