If the diploid number of chromosomes is 40, then number of chromosome in gemete will be :

Options

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

Answer

To find the number of chromosomes in a gamete when the diploid number of chromosomes is given as 40, we can follow these steps:

### Step-by-Step Solution

1. **Understand the Diploid Number**:
The diploid number (2n) refers to the total number of chromosomes in somatic (body) cells. In this case, the diploid number is given as 40.

2. **Identify the Haploid Number**:
Gametes (sperm and egg cells) are produced through a process called meiosis, which reduces the chromosome number by half. This means that gametes contain a haploid number of chromosomes (n).

3. **Calculate the Haploid Number**:
To find the haploid number, divide the diploid number by 2:
\[ n = \frac{2n}{2} = \frac{40}{2} = 20 \]

4. **Conclusion**:
Therefore, the number of chromosomes in a gamete is 20.

### Final Answer:
The number of chromosomes in a gamete is **20**.

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