### Step-by-Step Solution:
1. **Understanding the Term "Gene Shears":**
- The term "gene shears" refers to specific RNA molecules that are designed by scientists. They are involved in the manipulation of genetic information.
2. **Identifying the Nature of Gene Shears:**
- Gene shears are not just any RNA; they specifically relate to the process of cutting or fragmenting messenger RNA (mRNA).
3. **Role of mRNA in Genetics:**
- mRNA is produced when DNA is transcribed. It carries the genetic information necessary for protein synthesis. However, mRNA can contain both coding regions (exons) and non-coding regions (introns).
4. **Formation of Gene Shears:**
- The process involves splicing, where non-coding regions (introns) are removed from the mRNA. The remaining pieces of mRNA after this splicing are referred to as gene shears.
5. **Analyzing the Options:**
- The options provided were:
1. Pieces of mRNA
2. Endonucleases
3. Exonucleases
4. Mini lasers
- Based on the understanding that gene shears are related to mRNA, the correct answer is **"pieces of mRNA."**
6. **Conclusion:**
- Therefore, the correct answer to the question "Gene shears are" is **"pieces of mRNA."**
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