If a star is moving towards you, how does it affect the wavelength of the light waves that reach you?

when a star is moving towards you: wavelength decreases
when a star is moving further away from you: wavelength increases

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?