Which of the following statement is incorrect w.r.t. inbreeding?

Options

A. Inbreeding increases homozygosity
B. inbreeding exposes harmful recessive genes that are eliminated by selection
C. Inbreeding helps in accumulation of deleterious alleles and elimination of desirable alleles
D. inbreeding helps in developing a pure- line in animal

Answer

To determine which statement is incorrect with respect to inbreeding, we can analyze each option step-by-step:

### Step 1: Understand Inbreeding
Inbreeding is the mating of individuals that are closely related by ancestry. This practice is often used in agriculture and animal breeding to enhance certain desirable traits.

### Step 2: Analyze Each Statement
1. **Inbreeding increases homozygosity.**
- **Analysis:** This statement is correct. Inbreeding increases the proportion of homozygous individuals because closely related individuals share more alleles.

2. **Inbreeding exposes harmful recessive genes that are eliminated by selection.**
- **Analysis:** This statement is also correct. Inbreeding can bring harmful recessive alleles to expression, allowing for their elimination through selective breeding.

3. **Inbreeding helps in accumulation of deleterious alleles and elimination of desirable alleles.**
- **Analysis:** This statement is incorrect. Inbreeding typically leads to the accumulation of desirable alleles and the elimination of deleterious alleles. The goal of inbreeding is to enhance desirable traits, not to accumulate harmful ones.

4. **Inbreeding helps in developing a pure line in animals.**
- **Analysis:** This statement is correct. Inbreeding is used to create pure lines, as it increases homozygosity and ensures that desirable traits are consistently passed on.

### Conclusion
- The incorrect statement regarding inbreeding is: **"Inbreeding helps in accumulation of deleterious alleles and elimination of desirable alleles."**

### Final Answer
The incorrect statement with respect to inbreeding is option 3.

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