Assertion (A) : Continued inbreeding , especially close inbreeding , usually reduces fertility and even productivity .
Reason (R) : Selected animals of the inbreeding population should be mated with unrelated superior animals of the same breed usually not helps in restoring of fertility and yield.

Options

A. Both A and R are correct and R is the correct explanation of A
B. Both A and R are correct but R is not the correct explanation of A
C. A is true but R is false
D. A is false and R is true

Answer

### Step-by-Step Solution:

1. **Understanding Inbreeding**:
- Inbreeding refers to the mating of closely related individuals over several generations (typically 4 to 6 generations). This process can lead to the expression of superior traits in the offspring due to increased homozygosity, which means that the offspring are more likely to inherit the same alleles from both parents.

**Hint**: Inbreeding involves mating closely related individuals to enhance certain traits.

2. **Advantages of Inbreeding**:
- One advantage of inbreeding is the ability to identify and eliminate undesirable genes from the gene pool. As inbreeding continues, undesirable traits become more apparent, allowing for selective breeding to enhance desirable characteristics.

**Hint**: Inbreeding can help in identifying and removing undesirable traits.

3. **Disadvantages of Inbreeding**:
- A significant disadvantage of continued inbreeding is the phenomenon known as inbreeding depression. This occurs when there is a lack of genetic variation, leading to reduced fertility and productivity in the offspring. The inability to adapt to environmental changes can also result in a lower survival rate.

**Hint**: Inbreeding depression leads to reduced fertility and adaptability.

4. **Outcrossing as a Solution**:
- To combat inbreeding depression, breeders can introduce unrelated superior animals of the same breed through a process known as outcrossing. This helps restore genetic diversity and can improve fertility and productivity.

**Hint**: Outcrossing involves mating unrelated individuals of the same breed to restore genetic diversity.

5. **Evaluating the Assertion and Reason**:
- The assertion states that continued inbreeding reduces fertility and productivity, which is true due to inbreeding depression.
- The reason states that mating selected animals from the inbreeding population with unrelated superior animals does not help restore fertility and yield. This statement is false because outcrossing does help restore fertility and productivity.

6. **Conclusion**:
- Therefore, the assertion (A) is true, while the reason (R) is false. The correct answer is that A is true but R is false.

### Final Answer:
- Assertion (A) is true, and Reason (R) is false.