Migration of ....... towards the opposite poles is characteristic feature of anaphase during mitosis.

Options

A. Single chromatid chromosomes
B. double chromatid chromosomes
C. tetrad chromosomes
D. dyad chromosomes

Answer

To solve the question regarding the migration of certain structures towards the opposite poles during anaphase in mitosis, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Mitosis**: Mitosis is a process of cell division that results in two genetically identical daughter cells. It consists of several phases: prophase, metaphase, anaphase, and telophase.

2. **Focus on Anaphase**: The question specifically asks about the anaphase stage of mitosis. During anaphase, the sister chromatids are separated and pulled towards opposite poles of the cell.

3. **Role of Centromeres**: At the beginning of anaphase, the centromeres that hold the sister chromatids together split. This is a crucial event that allows the chromatids to move apart.

4. **Migration of Chromatids**: Once the centromeres split, the sister chromatids (now referred to as individual chromosomes) are pulled towards opposite poles of the cell by the spindle fibers attached to the kinetochores.

5. **Conclusion**: Therefore, the migration of **sister chromatids** towards the opposite poles is a characteristic feature of anaphase during mitosis.

6. **Final Answer**: The correct fill-in for the blank in the question is "sister chromatids".