In which stage of meiosis, the chromosome number reduces to half ?
(a) Anaphase-I
(b) Anaphase-II
(c) Telophase-I
(d) Telophase-II

Options

A. Anaphase-I
B. Anaphase-II
C. Telophase-I
D. Telophase-II

Answer

To determine in which stage of meiosis the chromosome number reduces to half, we can analyze the options given:

1. **Understanding Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells from one diploid cell. It consists of two main stages: Meiosis I and Meiosis II.

2. **Meiosis I**: During Meiosis I, homologous chromosomes pair up and are separated. This is where the reduction in chromosome number occurs.

3. **Anaphase I**: In Anaphase I, the homologous chromosomes are pulled apart to opposite poles of the cell. This separation reduces the chromosome number from diploid (2n) to haploid (n). Each chromosome still consists of two sister chromatids at this stage.

4. **Anaphase II**: In Anaphase II, the sister chromatids are separated. However, the chromosome number has already been halved in Anaphase I, so this stage does not contribute to the reduction of chromosome number.

5. **Telophase I and Telophase II**: These stages involve the completion of the cell division process but do not involve the reduction of chromosome number. Telophase I follows Anaphase I and results in two cells, each with half the original chromosome number. Telophase II occurs after Anaphase II and does not affect the chromosome number further.

6. **Conclusion**: The stage in which the chromosome number reduces to half is Anaphase I.

**Final Answer**: (a) Anaphase-I

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