The phase of mitosis in which chromosomes are thickest and shortest is

Options

A. Metaphase
B. Prophase
C. Telophase
D. Anaphase

Answer

To determine the phase of mitosis in which chromosomes are thickest and shortest, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Mitosis Phases**: Mitosis consists of several phases: prophase, metaphase, anaphase, and telophase. Each phase has distinct characteristics regarding the appearance and behavior of chromosomes.

2. **Analyze Each Phase**:
- **Prophase**: During this phase, chromosomes begin to condense and become visible, but they are not at their thickest or shortest yet.
- **Metaphase**: In this phase, chromosomes are maximally condensed and aligned at the metaphase plate. This is when they are at their thickest and shortest.
- **Anaphase**: Here, the sister chromatids are pulled apart towards opposite poles, which means they start to elongate and are not at their thickest.
- **Telophase**: In this phase, the chromosomes reach the poles and begin to de-condense, becoming less thick and longer as the nuclear envelope starts to reform.

3. **Identify the Correct Phase**: Based on the analysis, the phase where chromosomes are the thickest and shortest is clearly **metaphase**.

### Final Answer:
The phase of mitosis in which chromosomes are thickest and shortest is **metaphase**.

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