The following event is incorrect with reference to meiosis

Options

A. Nucleus divides twice
B. Chromosomes divide twice
C. Chromosomes divide once
D. Centromere divides once

Answer

To determine which event is incorrect with reference to meiosis, let’s analyze each of the given options step by step:

### Step 1: Understand Meiosis
Meiosis is a specialized type of cell division that reduces the chromosome number by half, resulting in four haploid daughter cells from one diploid parent cell. It consists of two sequential divisions: Meiosis I and Meiosis II.

### Step 2: Analyze Each Option
1. **Nucleus divides twice**: This statement is correct. During meiosis, the nucleus undergoes two divisions (Meiosis I and Meiosis II).

2. **Chromosomes divide twice**: This statement is incorrect. Chromosomes only divide once during Meiosis II. In Meiosis I, homologous chromosomes separate, but the chromatids do not divide until Meiosis II.

3. **Chromosomes divide once**: This statement is correct. As mentioned, chromosomes divide during Meiosis II only.

4. **Centromere divides once**: This statement is also correct. The centromere divides during Meiosis II when the sister chromatids are separated.

### Step 3: Identify the Incorrect Statement
From the analysis:
- The first, third, and fourth statements are correct.
- The second statement, "Chromosomes divide twice," is incorrect.

### Conclusion
The incorrect event with reference to meiosis is that "chromosomes divide twice."

### Final Answer
The incorrect statement is: **Chromosomes divide twice.**

---