**Core Concept**
Transposons, also known as jumping genes, are mobile genetic elements that can change their position within a genome. These elements are capable of replicating and inserting themselves into new locations, often disrupting gene function. Transposons are a key component of the genome and play a critical role in evolution.

**Why the Correct Answer is Right**
Transposons, such as the bacteriophage Mu and the maize controlling element Ac, use enzymes like transposase to catalyze their movement. This process involves a cut-and-paste mechanism, where the transposon is excised from its original location and then inserted into a new site. Transposons can be found in both prokaryotic and eukaryotic genomes and have been implicated in various genetic disorders.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the concept of jumping genes.
**Option B:** This option is incorrect because it does not accurately describe the definition of a jumping gene.
**Option C:** This option is incorrect because it is not a known type of jumping gene.

**Clinical Pearl / High-Yield Fact**
Transposons can have a significant impact on gene expression and genome stability. They can be used as tools for genetic engineering and are an important area of research in the field of molecular biology.

**Correct Answer: D. Transposons. Transposons are mobile genetic elements that can change their position within a genome.**