Which of the following is not a significance of meiosis ?

Options

A. Frormation of gametes
B. Increases genetic variability
C. Reduction of chromosome number of half
D. Replaces old dead and worn out cells

Answer

To determine which of the following options is not a significance of meiosis, we need to analyze each option in the context of what meiosis accomplishes.

### Step-by-Step Solution:

1. **Understanding Meiosis**:
- Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the formation of gametes (sperm and eggs). It is often referred to as reductional division.

2. **Analyzing the Options**:
- **Option A: Formation of gametes**: This is a primary significance of meiosis. Meiosis specifically produces haploid gametes from diploid germ cells. Therefore, this option is significant.

- **Option B: Increases genetic variability**: Meiosis introduces genetic variability through processes such as crossing over and independent assortment. This is also a significant aspect of meiosis, as it leads to diverse offspring.

- **Option C: Reduction of chromosome number by half**: This is a defining feature of meiosis. It reduces the diploid number of chromosomes in the parent cell to a haploid number in the daughter cells. Thus, this option is significant as well.

- **Option D: Replaces old dead and worn out cells**: This process is not a significance of meiosis. The replacement of old and worn-out cells is primarily achieved through mitosis, which is an equational division that maintains the chromosome number.

3. **Conclusion**:
- The option that is not a significance of meiosis is **Option D: replaces old dead and worn out cells**.

### Final Answer:
**Option D: replaces old dead and worn out cells** is not a significance of meiosis.

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