A tetraploid female flowering plant and a hexaploid male flowering plant are crossed , endosperm will be

Options

A. heltaploid .
B. triploid.
C. hexaploid.
D. Pentaploid.

Answer

To solve the question regarding the endosperm formation when a tetraploid female flowering plant is crossed with a hexaploid male flowering plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ploidy Levels**:
- The female plant is tetraploid (4n).
- The male plant is hexaploid (6n).

2. **Determine the Gamete Formation**:
- During gamete formation, the ploidy level is halved. Therefore:
- The female gametes will be haploid (n) from the tetraploid plant:
\[ \text{Female gamete} = \frac{4n}{2} = 2n \]
- The male gametes will also be haploid (n) from the hexaploid plant:
\[ \text{Male gamete} = \frac{6n}{2} = 3n \]

3. **Understand Endosperm Formation**:
- The endosperm is formed through a process called triple fusion, where one male gamete fuses with two polar nuclei in the female gametophyte.
- In this case, the male gamete contributes its genetic material to the endosperm.

4. **Calculate the Ploidy of the Endosperm**:
- The endosperm will be formed by the fusion of one male gamete (3n) and two polar nuclei (each contributing n):
\[ \text{Endosperm ploidy} = 3n + n + n = 5n \]
- Therefore, the endosperm will be pentaploid (5n).

5. **Conclusion**:
- The endosperm resulting from the cross between a tetraploid female and a hexaploid male will be pentaploid (5n).

### Final Answer:
The endosperm will be pentaploid (5n).

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