**Core Concept**
Transversion is a type of point mutation in DNA where a purine is replaced by a pyrimidine or vice versa. This type of mutation involves the substitution of a pyrimidine (cytosine or thymine) for a purine (adenine or guanine) or vice versa.

**Why the Correct Answer is Right**
Transversions occur due to errors during DNA replication and repair, leading to the substitution of a pyrimidine for a purine or vice versa. This type of mutation can result in the substitution of a different amino acid in a protein, potentially leading to changes in protein function or structure. The process involves the incorrect pairing of nucleotides during DNA replication, resulting in the incorporation of a mismatched base into the DNA strand.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the type of mutation. While it may be a type of mutation, it is not a transversion.
* **Option B:** This option is incorrect because it is a type of frameshift mutation, not a point mutation like transversion.

**Clinical Pearl / High-Yield Fact**
Transversions are one of the three main types of point mutations, along with transitions and insertions/deletions (indels). Understanding the different types of mutations is crucial for identifying genetic disorders and developing targeted therapies.

**Correct Answer: D. Transversion seen in point mutations.**