White lions are getting extinct and can be protected by

Options

A. Test cross
B. Reciprocal cross
C. Back cross
D. Triple cross

Answer

### Step-by-Step Solution:

1. **Understanding the Problem**: The question states that white lions are getting extinct and asks how they can be protected. The options provided are different types of genetic crosses.

2. **Identifying the Options**:
- **Option A**: Test cross
- **Option B**: Reciprocal cross
- **Option C**: Black cross
- **Option D**: Triple cross

3. **Analyzing the Options**:
- **Test Cross**: This involves crossing an individual with a known genotype with an individual with a recessive phenotype to determine the genotype of the former. This method is not directly related to conservation.
- **Reciprocal Cross**: This involves crossing two individuals where one is expressing a trait (in this case, white lions) and the other does not express the trait. This can help in producing offspring that may inherit the desired traits, which is beneficial for conservation.
- **Black Cross**: This term is not commonly used in genetics and does not apply to the context of conservation.
- **Triple Cross**: This is also not a standard term in genetics and does not relate to the protection of species.

4. **Conclusion**: The best option for protecting white lions from extinction is the **reciprocal cross**. This method allows for the combination of genetic traits that can help increase the population of white lions.

5. **Final Answer**: Therefore, the correct answer is **Option B: Reciprocal Cross**.