the mechanism that causes a gene to move from one linkage group to another is called :

Options

A. Inversion
B. Duplication
C. Translocation
D. Crossing-over

Answer

To answer the question, "the mechanism that causes a gene to move from one linkage group to another is called:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Linkage**:
- Linkage refers to the phenomenon where genes that are located close to each other on a chromosome tend to be inherited together. These genes are known as linked genes.

2. **Analyzing the Options**:
- The options given are: inversion, duplication, translocation, and crossover. We need to evaluate each option to determine which one fits the description of a gene moving from one linkage group to another.

3. **Evaluating Inversion**:
- Inversion is a chromosomal rearrangement where a segment of a chromosome is reversed end to end. This does not involve the movement of genes between different linkage groups, so it is not the correct answer.

4. **Evaluating Duplication**:
- Duplication involves the copying of a segment of a chromosome, resulting in multiple copies of that segment. Similar to inversion, this does not lead to the movement of genes between linkage groups, so it is also not the correct answer.

5. **Evaluating Translocation**:
- Translocation is the process where a segment of a chromosome breaks off and attaches to a different chromosome, which can result in the movement of genes from one linkage group to another. This matches the description provided in the question.

6. **Evaluating Crossover**:
- Crossover refers to the exchange of genetic material between homologous chromosomes during meiosis. While it does involve the recombination of genetic material, it does not specifically refer to the movement of genes between different linkage groups.

7. **Conclusion**:
- Based on the analysis, the correct answer to the question is **translocation**, as it is the mechanism that causes a gene to move from one linkage group to another.

### Final Answer:
The mechanism that causes a gene to move from one linkage group to another is called **translocation**.