If the endosperm cells of an angiosperm seed are pentaloid , the such a seed may have been formed by which of the following parents ?

Options

A. Triploid female and diploid male.
B. Diploid male and tetraploid female.
C. Both parents are tertraploid.
D. Triploid male and diploid female.

Answer

To solve the question regarding the formation of a pentaploid endosperm in an angiosperm seed, we will analyze the genetic contributions of the parents involved in the fertilization process. Here's a step-by-step breakdown:

### Step 1: Understand the Terms
- **Endosperm**: A tissue that provides nourishment to the developing embryo in seeds.
- **Pentaploid**: A cell or organism with five sets of chromosomes (5n).
- **Triple Fusion**: The process in which one male gamete fuses with two polar nuclei in the embryo sac to form the endosperm.

### Step 2: Identify Parental Contributions
1. **Female Parent**: The endosperm is formed from the fusion of one male gamete (from the pollen) and two polar nuclei (from the ovule). The genetic contribution of the female parent is crucial in determining the ploidy level of the endosperm.
2. **Male Parent**: The male gamete contributes one set of chromosomes.

### Step 3: Analyze Each Option
- **Option A**: Triploid female (3n) and diploid male (2n)
- Endosperm = 2n (from male) + 3n (from female) = 5n (Pentaploid)

- **Option B**: Diploid male (2n) and tetraploid female (4n)
- Endosperm = 2n (from male) + 4n (from female) = 6n (Hexaploid)

- **Option C**: Both parents are tetraploid (4n)
- Endosperm = 4n (from female) + 4n (from male) = 8n (Octaploid)

- **Option D**: Triploid male (3n) and diploid female (2n)
- Endosperm = 2n (from female) + 3n (from male) = 5n (Pentaploid)

### Step 4: Determine the Correct Answer
From the analysis:
- Options A and D both yield a pentaploid endosperm (5n).
- However, the question specifically asks for the scenario where the endosperm cells are pentaploid, which can occur with a triploid female and diploid male (Option A) or a triploid male and diploid female (Option D).

### Final Answer
The correct answer is **Option A**: Triploid female and diploid male.

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