Which type of endosperm will be formed on hybridisation of diploid female plant and tetraploid male plant?

Options

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

Answer

To determine the type of endosperm formed from the hybridization of a diploid female plant and a tetraploid male plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ploidy Levels**:
- The diploid female plant has a ploidy level of 2n (where n is the number of chromosomes).
- The tetraploid male plant has a ploidy level of 4n.

2. **Gamete Formation**:
- In the diploid female plant, the gametes formed will be:
- Egg cell: n (haploid)
- Two polar nuclei: n + n = 2n (these are also haploid nuclei that come together to form the endosperm).
- In the tetraploid male plant, the gametes formed will be:
- Two male gametes, each with a ploidy level of 2n (since it is tetraploid).

3. **Fertilization Process**:
- The egg (n) from the female plant will fertilize with one of the male gametes (2n):
- Zygote formation: n (egg) + 2n (male gamete) = 3n (triploid zygote).
- The two polar nuclei (2n) from the female plant will fertilize with the second male gamete (2n):
- Endosperm formation: 2n (two polar nuclei) + 2n (second male gamete) = 4n (tetraploid endosperm).

4. **Conclusion**:
- The type of endosperm formed from the hybridization of a diploid female plant and a tetraploid male plant is **tetraploid (4n)**.

### Final Answer:
The endosperm formed will be **tetraploid (4n)**.

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