As mitosis begins, a condensed chromosome appears to consist of two -

Options

A. Centromeres
B. Centriole
C. Centrosome
D. Chromatids

Answer

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). The interphase includes G1, S, and G2 phases.

2. **Interphase and Chromatin**: During interphase, the genetic material is in the form of chromatin, which is less condensed and allows for DNA replication and transcription.

3. **S Phase**: In the S phase, DNA replication occurs. Each chromosome is duplicated, resulting in two identical copies called sister chromatids.

4. **Condensation of Chromosomes**: As the cell enters mitosis (M phase), the chromatin condenses to form visible chromosomes. Each chromosome is now made up of two sister chromatids.

5. **Structure of a Condensed Chromosome**: At the beginning of mitosis, a condensed chromosome appears as a structure consisting of two identical sister chromatids joined at a region called the centromere.

6. **Conclusion**: Therefore, as mitosis begins, a condensed chromosome appears to consist of two sister chromatids.

### Final Answer:
A condensed chromosome appears to consist of two sister chromatids.

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