The two chromatids of a metaphase chromosome represent

Options

A. Homologous chromosome of a diploid set
B. Replicated chromosomes to be separated at anaphase
C. Nonhomologous chromosomes joined at the centromere
D. Maternal and paternal chromosomes joined at the centromere

Answer

To answer the question, "The two chromatids of a metaphase chromosome represent," we need to analyze the structure and function of chromatids during the cell cycle, particularly during the metaphase stage.

### Step-by-Step Solution:

1. **Understanding Chromatids**:
- During the cell cycle, specifically in the S phase, DNA replication occurs, resulting in the formation of two identical copies of each chromosome. These copies are known as sister chromatids.

2. **Metaphase Overview**:
- In metaphase, the chromosomes are aligned at the metaphase plate (the equatorial plane of the cell). Each chromosome consists of two sister chromatids joined together at a region called the centromere.

3. **Function of Sister Chromatids**:
- The sister chromatids are crucial for ensuring that each daughter cell receives an identical set of chromosomes during cell division. They are not homologous chromosomes; rather, they are identical copies of the same chromosome.

4. **Separation at Anaphase**:
- During the subsequent stage, anaphase, the sister chromatids are pulled apart by spindle fibers and move towards opposite poles of the cell. This separation is essential for the distribution of genetic material to the daughter cells.

5. **Conclusion**:
- Therefore, the two chromatids of a metaphase chromosome represent replicated chromosomes that are to be separated at anaphase.

### Final Answer:
The two chromatids of a metaphase chromosome represent replicated chromosomes to be separated at anaphase.

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