If male plan is hexaploid and female plant is tetraploid , the endoderm will be :

Options

A. 6n
B. 8n
C. 12n
D. 7n

Answer

To determine the ploidy of the endosperm when the male plant is hexaploid (6N) and the female plant is tetraploid (4N), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ploidy of Male Plant:**
- The male plant is hexaploid, which means it has a ploidy level of 6N.

2. **Determine the Ploidy of Male Gametes:**
- Male gametes (pollen grains) are produced from the pollen mother cells through meiosis.
- Since the male plant is hexaploid (6N), the pollen mother cells will also be 6N.
- During meiosis, the ploidy is halved, so the pollen grains will have a ploidy of 3N.

3. **Identify the Ploidy of Female Plant:**
- The female plant is tetraploid, meaning it has a ploidy level of 4N.

4. **Determine the Ploidy of Female Gametes:**
- Female gametes (egg cells) are produced from the megaspor mother cells through meiosis.
- Since the female plant is tetraploid (4N), the megaspor mother cells will also be 4N.
- During meiosis, the ploidy is halved, so the egg cells will have a ploidy of 2N.

5. **Understand the Formation of Endosperm:**
- In the fertilization process, one pollen grain (3N) will fuse with the egg cell (2N) to form the zygote.
- The second pollen grain (3N) will fuse with the two polar nuclei present in the female gametophyte.
- The two polar nuclei (from the female gametophyte) are each 2N, so together they contribute a ploidy of 2N.

6. **Calculate the Ploidy of the Endosperm:**
- The endosperm is formed by the fusion of one pollen grain (3N) and the two polar nuclei (2N + 2N = 4N).
- Therefore, the total ploidy of the endosperm will be:
\[ 3N + 4N = 7N \]

7. **Conclusion:**
- The ploidy of the endosperm will be 7N.

### Final Answer:
The endosperm will be **7N** (Option D).

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