The chromatids of a chromosome are attached at a point called:

Options

A. centriole
B. centromere
C. chromomere
D. centrosome

Answer

**Step-by-Step Solution:**

1. **Understanding Chromatids**: A chromosome consists of two identical halves called chromatids. Each chromatid is a copy of the DNA molecule.

2. **Identifying the Structure**: When two chromatids are joined together, they form a complete structure known as a chromosome.

3. **Locating the Attachment Point**: The point where the two chromatids are attached is crucial for understanding chromosome structure. This attachment occurs at a specific region.

4. **Naming the Attachment Point**: The attachment point of the two chromatids is called the **centromere**. This is the region that holds the chromatids together until they are separated during cell division.

5. **Additional Information**: At the centromere, there is also a structure known as the **kinetochore**, which is important for the attachment of spindle fibers during cell division.

6. **Conclusion**: Therefore, the chromatids of a chromosome are attached at the **centromere**.

**Final Answer**: The chromatids of a chromosome are attached at a point called the **centromere**.

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