Which of the statement about breeding is wrong

Options

A. By inbreeding purelines cannot be evolved
B. Continued inbreeding , especially close inbreeding increases fertility and productivity
C. Cross - breeding allows desirable qualities of two different breeds to be combined
D. Inbreeding exposes harmful recessive genes that are eliminated by selection

Answer

To determine which statement about breeding is wrong, we need to analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding Inbreeding and Outbreeding**:
- Inbreeding involves breeding between individuals of the same breed, while outbreeding involves breeding between different breeds.
- The primary goal of inbreeding is often to develop pure lines in animals.

2. **Evaluating Statement 1**:
- The first statement claims that "by inbreeding, pure lines cannot be evolved."
- This statement is incorrect because inbreeding is specifically used to evolve pure lines. Thus, this statement is wrong.

3. **Evaluating Statement 2**:
- The second statement states that "continued inbreeding, especially in close inbreeding, increases fertility and productivity."
- This statement is also incorrect. Continued inbreeding, particularly close inbreeding, tends to decrease fertility and productivity due to the accumulation of harmful recessive traits. So, this statement is wrong as well.

4. **Evaluating Statement 3**:
- The third statement mentions that "crossbreeding allows desirable qualities of the two breeds to be combined."
- This statement is correct. Crossbreeding is indeed used to combine desirable traits from two different breeds.

5. **Evaluating Statement 4**:
- The fourth statement says that "inbreeding exposes harmful recessive genes that can be eliminated by selection."
- This statement is also correct. Inbreeding can reveal harmful recessive genes, and through selective breeding, these can be eliminated from the population.

6. **Conclusion**:
- The first and second statements are incorrect, making them the wrong statements about breeding. The correct statements are the third and fourth ones.

### Final Answer:
The wrong statements about breeding are:
1. "By inbreeding, pure lines cannot be evolved."
2. "Continued inbreeding, especially in close inbreeding, increases fertility and productivity."