In which stage of meiosis homologous chromosomes are segregated?

Options

A. Metaphase I
B. Anaphase I
C. Anaphase II
D. Metaphase II

Answer

To determine in which stage of meiosis homologous chromosomes are segregated, we can analyze the different stages of meiosis:

1. **Understanding Meiosis**: Meiosis consists of two main stages: Meiosis I and Meiosis II. Each of these stages is further divided into sub-stages.

2. **Stages of Meiosis I**:
- **Prophase I**: Homologous chromosomes pair up and exchange genetic material through a process called crossing over.
- **Metaphase I**: The paired homologous chromosomes align at the metaphase plate (equator of the cell).
- **Anaphase I**: The homologous chromosomes are pulled apart and move towards opposite poles of the cell.
- **Telophase I**: The cell divides into two daughter cells, each with half the number of chromosomes.

3. **Stages of Meiosis II**:
- **Prophase II**: The chromosomes condense again, and the nuclear envelope breaks down if it had reformed.
- **Metaphase II**: Chromosomes align at the metaphase plate again.
- **Anaphase II**: The sister chromatids are pulled apart to opposite poles.
- **Telophase II**: The cells divide again, resulting in four haploid daughter cells.

4. **Identifying the Stage of Homologous Chromosome Segregation**:
- The key stage where homologous chromosomes are segregated is **Anaphase I**. During this stage, the homologous chromosomes separate and move to opposite poles of the cell.

5. **Conclusion**: Therefore, the correct answer to the question is **Anaphase I**.