Which of the following is true about the chromatids?

Options

A. It is a haploid chromosome
B. It is a complete chromosome
C. It is a duplicate chromosome
D. It is one-half of the replicated chromosome

Answer

To determine which statement is true about chromatids, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Chromatids**:
- Chromatids are the two identical halves of a replicated chromosome. When a cell prepares to divide, it duplicates its chromosomes, resulting in two sister chromatids for each chromosome.

**Hint**: Remember that chromatids are formed during the S phase of the cell cycle when DNA is replicated.

2. **Analyzing the Options**:
- **Option 1: It is a haploid chromosome**: This statement is incorrect. Chromatids are not haploid; they are part of a diploid chromosome during the cell cycle.

**Hint**: Recall the difference between haploid and diploid cells.

- **Option 2: It is a complete chromosome**: This statement is also incorrect. A chromatid is not a complete chromosome; it is only one half of a duplicated chromosome.

**Hint**: Think about the structure of a chromosome and how chromatids relate to it.

- **Option 3: It is a duplicate chromosome**: This statement is misleading. While chromatids are identical copies, they are not considered duplicate chromosomes until they separate during cell division.

**Hint**: Consider the timing of when chromatids are referred to as chromosomes.

- **Option 4: It is one half of the replicated chromosome**: This statement is correct. Each chromatid is indeed one half of a replicated chromosome, which consists of two sister chromatids joined at the centromere.

**Hint**: Focus on the definition of chromatids in relation to the structure of chromosomes.

3. **Conclusion**:
- The correct statement about chromatids is that "it is one half of the replicated chromosome."

### Final Answer:
The true statement about chromatids is: **It is one half of the replicated chromosome.**