Select the incorrect statement.

Options

A. inbreeding helps in accumulation of superior genes and elimination of undersirable genes.
B. Inbreeding increases homozygosity
C. Inbreeding is essential to evolve purelines, in any
D. Inbreeding selects harmful recessive gene that reduce fertility and productivity.

Answer

To solve the question of selecting the incorrect statement regarding inbreeding, we will analyze each statement provided.

### Step-by-Step Solution:

1. **Understand Inbreeding**: Inbreeding refers to the mating of closely related individuals within the same breed. This process is typically carried out over several generations (often 4 to 6) to increase homozygosity.

2. **Evaluate the Statements**: The question provides four statements related to inbreeding. We need to identify which one is incorrect.

3. **Analyze Each Statement**:
- **Statement 1**: Inbreeding increases homozygosity and helps in the accumulation of superior genes while eliminating undesirable genes.
- **Evaluation**: This statement is correct. Inbreeding does lead to increased homozygosity and can help in selecting for desirable traits.

- **Statement 2**: Inbreeding is necessary to evolve a pure line.
- **Evaluation**: This statement is also correct. Inbreeding is often used to develop pure lines in breeding programs.

- **Statement 3**: Inbreeding exposes harmful recessive genes that are eliminated by selection.
- **Evaluation**: This statement is correct. Inbreeding can reveal harmful recessive traits, which can then be selected against.

- **Statement 4**: Inbreeding selects harmful recessive genes that reduce fertility and productivity.
- **Evaluation**: This statement is incorrect. While inbreeding can expose harmful recessive genes, it does not select for them; rather, it typically leads to their elimination through selection.

4. **Select the Incorrect Statement**: Based on the evaluations, the fourth statement is the incorrect one.

### Final Answer:
The incorrect statement is: **Inbreeding selects harmful recessive genes that reduce fertility and productivity.**