Identify the incorrect expression from the following statements :

Options

A. Syncytium of coconut water is because of karyokinesis which is not followed cytokinesis
B. Sister chromatid synthesis takes place in S phase of cell cycle
C. Meiosis plays a significant role in the replacement of blood cells.
D. Meiosis increases the genetic variability in the organisms which is very important for the process of evolution

Answer

To identify the incorrect expression from the given statements, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement 1**: "Syncytium of coconut water is because of karyokinesis which is not followed by cytokinesis."
- **Explanation**: This statement is correct. In the case of coconut water, the cells undergo karyokinesis (nuclear division) without cytokinesis (cytoplasmic division), leading to a multinucleated structure called syncytium.

2. **Statement 2**: "Sister chromatid synthesis takes place in the S phase of the cell cycle."
- **Explanation**: This statement is also correct. The S phase (Synthesis phase) of the cell cycle is where DNA replication occurs, resulting in the formation of sister chromatids.

3. **Statement 3**: "Meiosis plays a significant role in the replacement of blood cells."
- **Explanation**: This statement is incorrect. Meiosis is a type of cell division that produces gametes (sperm and eggs) and is not involved in the replacement of blood cells. Blood cells are typically replaced through mitosis, not meiosis.

4. **Conclusion**: The incorrect expression is found in Statement 3.

### Final Answer:
The incorrect expression is: "Meiosis plays a significant role in the replacement of blood cells."

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