A forward mutation resulting in a green-eyed phenotype was generated in fruit flies by UV exposure. A second UV exposure, however, reversed that mutation as measured by the return of the wild-type phenotype. A researcher conducted a DNA analysis of these mutations. To her surprise, it revealed that the original "green-eye" mutation, which she identified as a nonsense mutation, was still retained in the now normal organism. Moreover, she identified a second mutation within a second gene, which was a tRNA gene. This researcher found evidence of a(n)silent mutation in the green-eye gene.intragenic suppressor mutation.neutral mutation in the green-eye gene.intergenic suppressor mutation.loss-of-function mutation in the tRNA gene.

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