In a cross between a tetraploid female plantand a diploid male plant of mulberry, the endosperm would be

Options

A. Hexaploid
B. Triploid
C. Tetraploid
D. Pentaploid

Answer

To solve the question regarding the endosperm formation in a cross between a tetraploid female plant and a diploid male plant of mulberry, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ploidy Levels**:
- The female plant is tetraploid (4n).
- The male plant is diploid (2n).

2. **Determine the Gametes**:
- In flowering plants, the pollen grains (male gametes) are haploid (n). Since the male plant is diploid (2n), the pollen produced will be haploid (n).
- The central cell of the ovule in the tetraploid female plant is diploid (2n) but since it is tetraploid, the central cell will be 4n.

3. **Formation of the Endosperm**:
- The endosperm is formed by the fusion of the haploid male gamete (pollen grain) with the diploid central cell.
- The central cell (4n) from the female plant fuses with the haploid male gamete (n) to form the endosperm.

4. **Calculate the Ploidy of the Endosperm**:
- The ploidy of the endosperm can be calculated as follows:
- Central cell (4n) + Pollen grain (n) = Endosperm (4n + n) = 5n.

5. **Conclusion**:
- Therefore, the endosperm formed from this cross will be pentaploid (5n).

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

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