Metaphase -II of meiosis differs from metaphase - I in possessing

Options

A. Same number of chromosomes in cells and same number of chromatids in each chromosomes
B. half number of chromosomes in cells and half number of chromatids in each chromosomes
C. half number of chromosomes in cells and same number of chromatids in each chromosomes
D. Same number of chromosomes in cells and double number of chromatids in each chromosomes

Answer

To solve the question regarding the differences between metaphase I and metaphase II of meiosis, we need to analyze the characteristics of each phase in terms of chromosome number and chromatid number.

### Step-by-Step Solution:

1. **Understanding Meiosis**:
- Meiosis consists of two main stages: Meiosis I and Meiosis II. Each of these stages has distinct phases, including prophase, metaphase, anaphase, and telophase.

2. **Chromosome Number in Meiosis I**:
- During Meiosis I (specifically in metaphase I), homologous chromosomes (pairs of chromosomes) align at the metaphase plate. The cell is diploid (2n), meaning it has two sets of chromosomes.

3. **Chromosome Number in Meiosis II**:
- In Meiosis II (specifically in metaphase II), the sister chromatids of each chromosome align at the metaphase plate. The cell is haploid (n), meaning it has only one set of chromosomes, which is half the number of chromosomes present in metaphase I.

4. **Chromatid Number in Meiosis I**:
- In metaphase I, each chromosome consists of two sister chromatids (as they have been replicated during the S phase before meiosis begins).

5. **Chromatid Number in Meiosis II**:
- In metaphase II, each chromosome still consists of two sister chromatids, as they have not yet separated.

6. **Conclusion**:
- Therefore, the key differences are:
- In metaphase I, the cell has a diploid number of chromosomes (2n) and each chromosome has two chromatids.
- In metaphase II, the cell has a haploid number of chromosomes (n) and each chromosome still has two chromatids.

7. **Final Answer**:
- Based on the analysis, the correct option is that in metaphase II, there is a "half number of chromosomes in cells and the same number of chromatids in each chromosome."