Which of the following are the two simultaneous events of cell division in animal cells.

Options

A. DNA replication and DNA condensation
B. DNA replication and centriole duplication
C. Formation of mitotic spindle and division of centromere
D. Separation of chromatids and formation of two daughter cells.

Answer

To determine the two simultaneous events of cell division in animal cells, we need to analyze the options provided and understand the processes involved in cell division.

### Step-by-Step Solution:

1. **Understanding Cell Division**: Cell division in animal cells involves several stages, primarily mitosis and cytokinesis. During these processes, various events occur simultaneously.

2. **Analyzing the Options**:
- **Option 1: DNA replication and DNA condensation**:
- DNA replication occurs during the S phase of interphase, while DNA condensation occurs during prophase of mitosis. These events do not happen simultaneously.
- **Option 2: DNA replication and centriole duplication**:
- Both DNA replication and centriole duplication occur during the S phase of interphase. This means they happen simultaneously, making this option a strong candidate.
- **Option 3: Formation of the mitotic spindle and division of centromere**:
- The formation of the mitotic spindle occurs during prophase, while the division of the centromere happens during anaphase. Therefore, these events do not occur simultaneously.
- **Option 4: Separation of chromatids and formation of the two daughter cells**:
- The separation of chromatids occurs during anaphase, and the formation of two daughter cells occurs at the end of cytokinesis. These events are not simultaneous.

3. **Conclusion**: After analyzing all the options, the only pair of events that occur simultaneously during cell division in animal cells is **DNA replication and centriole duplication**.

### Final Answer:
The correct answer is **Option 2: DNA replication and centriole duplication**.

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