Select the incorrect statement:

Options

A. Inbreeding helps in accumulation of superior genes and elimination of undesirable genes.
B. Inbreeding increases homozygosity.
C. Inbreeding is essential to evolve pure lines in any animal
D. Inbreeding selects harmful recessive genes that reduce fertility and productivity.

Answer

To solve the question of selecting the incorrect statement regarding inbreeding, we will analyze each option provided in the context of genetics and breeding practices.

### Step-by-Step Solution:

1. **Understanding Inbreeding**:
- Inbreeding refers to the mating of closely related individuals. This can lead to an increase in homozygosity, meaning that the offspring are more likely to inherit the same alleles from both parents.

**Hint**: Remember that inbreeding involves mating between closely related individuals, which can affect genetic diversity.

2. **Evaluating Option 1**:
- The statement says, "Inbreeding helps in accumulation of superior genes and elimination of undesirable genes."
- This statement is incorrect because inbreeding often leads to the expression of harmful recessive genes, rather than the accumulation of superior genes. It can reduce genetic diversity and may not eliminate undesirable traits effectively.

**Hint**: Consider how inbreeding affects genetic variation and the expression of recessive traits.

3. **Evaluating Option 2**:
- The statement claims, "Inbreeding increases homozygosity."
- This is correct because repeated inbreeding increases the chances that offspring will inherit the same alleles from both parents, leading to homozygosity.

**Hint**: Think about how repeated mating of related individuals impacts genetic similarity.

4. **Evaluating Option 3**:
- The statement mentions, "Inbreeding is essential to evolve pure lines in animals."
- This is also correct as inbreeding can help maintain specific traits within a breed, leading to pure lines.

**Hint**: Pure lines are often maintained through controlled breeding practices, including inbreeding.

5. **Evaluating Option 4**:
- The statement states, "Inbreeding selects harmful recessive genes that reduce fertility and productivity."
- This statement is correct as inbreeding can lead to the expression of harmful recessive traits, which can negatively impact fertility and productivity.

**Hint**: Consider how the expression of recessive genes can affect the overall health and productivity of a population.

### Conclusion:
The incorrect statement is **Option 1**: "Inbreeding helps in accumulation of superior genes and elimination of undesirable genes." Inbreeding tends to increase the expression of recessive traits, which can be harmful rather than beneficial.