Anaphase I is marked by-

Options

A. Movement of homologous chromosomes toward their respective pole
B. Centromere division
C. Sister chromatids remain associated at centromere
D. a and c

Answer

### Step-by-Step Solution:

1. **Understanding Meiosis**: Meiosis consists of two main stages: Meiosis I and Meiosis II. Anaphase I occurs during Meiosis I, which is crucial for the separation of homologous chromosomes.

2. **Characteristics of Anaphase I**: During Anaphase I, the homologous chromosomes (each consisting of two sister chromatids) are pulled apart and move towards opposite poles of the cell. This is a key feature of this phase.

3. **Movement of Chromosomes**: The defining characteristic of Anaphase I is the movement of homologous chromosomes toward their respective poles. This is different from Anaphase II, where sister chromatids are separated.

4. **Centromere Behavior**: It is important to note that during Anaphase I, sister chromatids remain attached at their centromeres. This means that while the homologous chromosomes are moving apart, the sister chromatids of each chromosome do not separate until Anaphase II.

5. **Conclusion**: Therefore, Anaphase I is marked by the movement of homologous chromosomes toward the poles, while sister chromatids remain associated at the centromere.

### Final Answer:
Anaphase I is marked by the movement of homologous chromosomes toward the respective poles, while sister chromatids remain associated at the centromere.

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