The male gamete is x and egg is 3x. The ploidy level in embryo and endosperm will be

Options

A. 4s in embryo and 4x in endosperm
B. 4x in embryo and 7x in endosperm
C. 4x in embryo and 6x in endosperm
D. 6x in embryo and 12x in endosperm

Answer

To determine the ploidy levels in the embryo and endosperm given that the male gamete is X and the egg is 3X, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ploidy of Male Gamete and Egg:**
- The male gamete is given as X.
- The egg cell is given as 3X.

2. **Determine the Ploidy of the Zygote (Embryo):**
- The zygote is formed by the fusion of the male gamete (X) and the egg (3X).
- Therefore, the ploidy level of the zygote is:
\[ X + 3X = 4X \]
- The zygote will undergo mitosis to form the embryo, which will also have a ploidy of 4X.

3. **Determine the Ploidy of the Endosperm:**
- The endosperm is formed by the fusion of the second male gamete (X) with the polar nuclei. The polar nuclei consist of two nuclei, each having a ploidy of 3X.
- Therefore, the total ploidy of the polar nuclei is:
\[ 3X + 3X = 6X \]
- The second male gamete (X) fuses with the 6X polar nuclei to form the primary endosperm cell:
\[ X + 6X = 7X \]
- The primary endosperm cell (7X) will then undergo mitosis to form the endosperm, which will also have a ploidy of 7X.

4. **Conclusion:**
- The ploidy level in the embryo is 4X.
- The ploidy level in the endosperm is 7X.

### Final Answer:
- The ploidy levels are:
- **Embryo:** 4X
- **Endosperm:** 7X

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