What will be the gametic chromosome number of a cell, if somatic cell have 40 chromosome?
(a) 10
(b) 20
(c) 30
(d) 40

Options

A. 10
B. 20
C. 30
D. 40

Answer

To determine the gametic chromosome number from the somatic chromosome number, follow these steps:

### Step-by-Step Solution:

1. **Understand the Chromosome Types**:
- Somatic cells are the body cells that contain the full set of chromosomes, which is represented as 2n (diploid).
- Gametes are the reproductive cells (sperm and egg) that contain half the number of chromosomes, represented as n (haploid).

2. **Identify the Somatic Chromosome Number**:
- According to the question, the somatic cell has 40 chromosomes. This means that the diploid number (2n) is 40.

3. **Calculate the Gametic Chromosome Number**:
- To find the gametic chromosome number (n), you need to divide the somatic chromosome number by 2.
- So, n = 2n / 2 = 40 / 2 = 20.

4. **Conclusion**:
- The gametic chromosome number is 20.

### Final Answer:
The correct option is (b) 20.

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