Laura is in class when she begins to feel uncomfortable, irritated and unable to focus on anything that is happening. She decides to leave class to get some fresh air. As soon as she tries to get out of her chair, she has an overwhelming attack of anxiety, her heart is beating very fast and she is having difficulty breathing. Laura is suffering from a(an) disorder.

A) panic
B) phobic
C) obsessive-compulsive
D) generalized anxiety

Transposon can cause mutations in genes at or near the site of transposon insertion. it is possible for these elements to transpose away from their original site, causing a reversion of the mutant phenotype. in some cases, however, even more severe phenotypes appear when these elements excise from this site, due to events at or near the mutant allele. what might be happening to the transposon or the nearby gene to create more severe mutations?