How many chromosome shall be present in a diploid cell at mitotic anaphase if its egg cell has ten chromosome :-

Options

A. 10 (Ten)
B. 20(Twenty)
C. 30(Thirty)
D. 40(Forty)

Answer

To solve the question of how many chromosomes are present in a diploid cell at mitotic anaphase if its egg cell has ten chromosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Chromosome Number in Egg Cells**:
- The question states that the egg cell has 10 chromosomes. In humans and many organisms, egg cells are haploid (n), meaning they contain half the number of chromosomes found in diploid cells.

2. **Determine the Diploid Number**:
- Since the egg cell is haploid and has 10 chromosomes, the diploid number (2n) can be calculated as:
\[ \text{Diploid number} = 2 \times \text{Haploid number} = 2 \times 10 = 20 \]
- Therefore, the diploid cell has 20 chromosomes.

3. **Understand Mitosis and Anaphase**:
- During mitosis, specifically in the anaphase stage, the chromosomes are separated and pulled towards opposite poles of the cell. However, the total number of chromosomes remains the same as in the diploid cell.

4. **Count Chromosomes at Anaphase**:
- At anaphase, the chromosomes are still counted as a total number. Since the diploid cell started with 20 chromosomes, even during anaphase, the total number of chromosomes remains 20.

5. **Conclusion**:
- Therefore, the number of chromosomes present in a diploid cell at mitotic anaphase is 20.

### Final Answer:
The number of chromosomes present in a diploid cell at mitotic anaphase is **20** (Option B).