The ploidy of the aleurone cell when a "4n" female plant is crossed with "2n" male plant

Options

A. 5n
B. 4n
C. 3n
D. 2n

Answer

To determine the ploidy of the aleurone cell when a "4n" female plant is crossed with a "2n" male plant, we can follow these steps:

### Step-by-Step Solution:

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

2. **Determine the Gametes Produced**:
- The female plant (4n) will produce gametes that are "2n" (haploid gametes are produced through meiosis, so half of the ploidy).
- The male plant (2n) will produce gametes that are "1n" (haploid gametes).

3. **Crossing the Gametes**:
- When the female (2n) gamete fuses with the male (1n) gamete, we need to add the ploidy levels together.
- The resulting zygote will have a ploidy of:
- 2n (from female) + 1n (from male) = 3n.

4. **Formation of Endosperm**:
- In plants, the endosperm is formed from the fusion of two male gametes (1n each) with one female gamete (2n).
- Therefore, the endosperm will have a ploidy of:
- 1n + 1n + 2n = 4n.

5. **Aleurone Cell Ploidy**:
- The aleurone layer is part of the endosperm, which we have determined to be "4n".
- Thus, the ploidy of the aleurone cell is also "4n".

### Final Answer:
The ploidy of the aleurone cell is **4n**.

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