Number of chromosomes is 12 in endosperm. What shall be the number in megaspore mother cell .

Options

A. 8
B. 36
C. 12
D. 18

Explanation

To solve the problem of determining the number of chromosomes in the megaspore mother cell (MMC) when the endosperm has 12 chromosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Chromosome Number in Endosperm**:
- The endosperm is a triploid tissue formed during fertilization in flowering plants. It is created from the fusion of one sperm cell with two polar nuclei from the female gametophyte.

2. **Identify the Chromosome Number in Endosperm**:
- Given that the endosperm has 12 chromosomes, we can denote this as the triploid number (3n). Therefore, we can set up the equation:
\[ 3n = 12 \]

3. **Calculate the Haploid Number (n)**:
- To find the haploid number (n), we divide the triploid number by 3:
\[ n = \frac{12}{3} = 4 \]

4. **Determine the Diploid Number (2n)**:
- The megaspore mother cell is diploid (2n), as it is derived from the sporophyte generation. Therefore, we calculate the diploid number:
\[ 2n = 2 \times 4 = 8 \]

5. **Conclusion**:
- The number of chromosomes in the megaspore mother cell (MMC) is 8.

### Final Answer:
The number of chromosomes in the megaspore mother cell is **8**.

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