Which method is used to explore harmful recessive gene?

Options

A. Out-breeding
B. Inbreeding
C. Interspecific hybridisation
D. Cross-breeding

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
- The question asks about the method used to explore harmful recessive genes.

2. **Identifying the Methods:**
- The methods mentioned include outbreeding, inbreeding, interspecific hybridization, and crossbreeding.

3. **Outbreeding:**
- Outbreeding involves mating between different populations or species. This method generally reduces the chances of harmful recessive genes being expressed, as it increases genetic diversity.

4. **Inbreeding:**
- Inbreeding occurs when closely related individuals mate. This method increases the likelihood of harmful recessive genes being expressed because it can lead to the accumulation of these genes in the offspring. Therefore, inbreeding is a significant method for exploring harmful recessive genes.

5. **Interspecific Hybridization:**
- This method involves mating between different species (e.g., horse and donkey producing a mule). While it can lead to interesting genetic combinations, it does not specifically target harmful recessive genes.

6. **Crossbreeding:**
- Crossbreeding refers to mating between purebred organisms to produce offspring that are often more vigorous and dominant. This method also does not primarily focus on harmful recessive genes.

7. **Conclusion:**
- Among the methods discussed, inbreeding is the most relevant for exploring harmful recessive genes due to the increased risk of expressing these genes when closely related individuals mate.

**Final Answer:**
The method used to explore harmful recessive genes is **inbreeding**.

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