Chromatids of the same chromosome are called ________ chromatids.

Options

A. Synchronous
B. Sister
C. Secondary
D. Primary

Answer

To solve the question "Chromatids of the same chromosome are called ________ chromatids," we can follow these steps:

### Step-by-Step Solution:

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

2. **Identifying the Types of Chromatids**:
- There are different types of chromatids based on their relationship to each other. The question specifically asks for chromatids that belong to the same chromosome.

3. **Analyzing the Options**:
- The first option is "synchronous." This term refers to the timing of events and does not apply to the relationship between chromatids. So, this option is incorrect.
- The second option is "sister." This term specifically refers to the two identical chromatids that are formed when a chromosome is duplicated. This is the correct answer.
- The third option is "secondary." This term is not used to describe chromatids and is therefore incorrect.
- The fourth option is "primary." Similar to "secondary," this term does not refer to chromatids and is incorrect.

4. **Conclusion**:
- Based on the analysis, the correct answer to the question is "sister." Therefore, chromatids of the same chromosome are called **sister chromatids**.

### Final Answer:
Chromatids of the same chromosome are called **sister chromatids**.

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