Number of chromatids at metaphase is :

Options

A. Two each in mitosis and meiosis
B. Two in mitosis and one in meiosis
C. two in mitosis and four in meiosis
D. one in mitosis and two in meiosis

Answer

To determine the number of chromatids at metaphase, we need to understand the structure of chromosomes during this phase of cell division. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding Metaphase**:
- Metaphase is a stage in both mitosis and meiosis where chromosomes align at the metaphase plate (the equatorial plane of the cell).

2. **Chromosome Structure**:
- Each chromosome consists of two identical halves called sister chromatids, which are joined at a region called the centromere.

3. **Counting Chromatids**:
- During metaphase, each chromosome is composed of two sister chromatids. Therefore, if we consider a single chromosome, it has 2 chromatids.

4. **Mitosis and Meiosis**:
- In both mitosis and meiosis, the number of chromatids per chromosome remains the same. Thus, during metaphase of mitosis, each chromosome has 2 chromatids, and during metaphase of meiosis, each chromosome also has 2 chromatids.

5. **Conclusion**:
- Therefore, the total number of chromatids at metaphase is 2 for each chromosome, regardless of whether it is mitosis or meiosis.

### Final Answer:
The number of chromatids at metaphase is 2 in both mitosis and meiosis.

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