Which of the following is not a characteristic feature during mitosis in somatic cells ?

Options

A. Disappearance of nucleolus
B. Chromosome movement
C. Synapsis
D. Spindle fibres

Answer

To determine which of the following is not a characteristic feature during mitosis in somatic cells, we need to analyze each option provided:

1. **Disappearance of the nucleolus**: This is a characteristic feature of mitosis. During prophase, the nucleolus disappears as the chromatin condenses into visible chromosomes.

2. **Chromosome movement**: This is also a characteristic feature of mitosis. During metaphase, chromosomes align at the cell's equatorial plane, and during anaphase, they are pulled apart toward opposite poles of the cell.

3. **Synapses**: This is not a characteristic feature of mitosis. Synapsis refers to the pairing of homologous chromosomes, which occurs during meiosis, specifically in prophase I. This process is essential for genetic recombination and does not occur in mitosis.

4. **Spindle fibers**: The formation of spindle fibers is a characteristic feature of mitosis. Spindle fibers are responsible for separating the chromosomes during cell division.

Based on this analysis, the option that is not a characteristic feature during mitosis in somatic cells is **synapses**.

### Step-by-Step Solution:
1. Identify the features associated with mitosis.
2. Analyze each option provided in the question.
3. Confirm that disappearance of the nucleolus, chromosome movement, and spindle fibers are all features of mitosis.
4. Recognize that synapses is a feature of meiosis, not mitosis.
5. Conclude that the correct answer is synapses.