During anaphasic movements of chromosomes, ___ of each chromosome is/are towards the pole and ___ of the chromosome trail(s) behind.

Options

A. centromere, arms
B. arms, centromere
C. chromatids, centromere
D. none of these

Explanation

**Step-by-Step Solution:**

1. **Understanding Anaphase**: Anaphase is a stage in cell division (mitosis) where the chromosomes are separated and moved towards opposite poles of the cell.

2. **Chromosome Structure**: Each chromosome consists of two sister chromatids connected at a region called the centromere.

3. **Movement During Anaphase**: During anaphase, the centromeres of the chromosomes split, and the sister chromatids are pulled apart towards the poles of the cell.

4. **Identifying the Movement**: As the centromeres move towards the poles, the arms of the chromosomes (the parts of the chromatids that extend away from the centromere) do not move as quickly and thus trail behind.

5. **Final Answer**: Therefore, during the anaphasic movements of chromosomes, the centromere of each chromosome moves towards the pole and the arms of the chromosome trail behind.

**Complete Answer**: During anaphasic movements of chromosomes, the **centromere** of each chromosome moves towards the pole and **arms** of the chromosome trail behind.

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