Each chromosome at anaphase stage of bone marrow cell in our body has

Options

A. two chromatids
B. one chromatid
C. many chromatids
D. no chromatid

Answer

To answer the question regarding the number of chromatids in each chromosome at the anaphase stage of a bone marrow cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Bone Marrow Cells**:
- Bone marrow cells are somatic cells that undergo mitosis, which is a type of cell division that results in two identical daughter cells.

2. **Mitosis Overview**:
- Mitosis is divided into several phases: prophase, metaphase, anaphase, and telophase. During these phases, chromosomes are duplicated and then separated.

3. **Focus on Anaphase**:
- Anaphase is the stage in mitosis where sister chromatids are pulled apart. Each chromosome consists of two sister chromatids before anaphase begins.

4. **Chromatid Separation**:
- At the beginning of anaphase, each chromosome has two chromatids. As anaphase progresses, the sister chromatids separate and move toward opposite poles of the cell.

5. **Final Count of Chromatids**:
- By the end of anaphase, each chromosome has been separated into individual chromatids. Therefore, each chromosome now consists of only one chromatid.

6. **Conclusion**:
- Thus, at the anaphase stage of a bone marrow cell, each chromosome has one chromatid.

### Final Answer:
Each chromosome at the anaphase stage of a bone marrow cell in our body has **one chromatid** (Option B).

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