If the haploid no. of chromosomes in gymnosperm is 12, what will be the no. of chromosomes in its root and endosperm :-

Options

A. 12, 12
B. 12, 24
C. 24, 12
D. 24, 36

Answer

To solve the problem of determining the number of chromosomes in the root and endosperm of a gymnosperm given that the haploid number of chromosomes (n) is 12, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Haploid Number**:
- The haploid number of chromosomes (n) in gymnosperms is given as 12.

2. **Determine the Diploid Number for Roots**:
- In gymnosperms, the root cells are diploid (2n).
- To find the diploid number, we use the formula:
\[ \text{Diploid number (2n)} = 2 \times \text{Haploid number (n)} \]
- Substituting the value of n:
\[ 2n = 2 \times 12 = 24 \]
- Therefore, the number of chromosomes in the roots is **24**.

3. **Determine the Number of Chromosomes in Endosperm**:
- The endosperm in gymnosperms is haploid (n).
- Since the haploid number is already given as 12, the number of chromosomes in the endosperm is **12**.

4. **Summarize the Results**:
- The number of chromosomes in the root of the gymnosperm is **24**.
- The number of chromosomes in the endosperm of the gymnosperm is **12**.

### Final Answer:
- The number of chromosomes in the root is **24**, and in the endosperm is **12**.