Which of the following is diploid?

Options

A. Primary oocyte
B. oogonium
C. Secondary oocyte
D. Both (1) & (2)

Answer

To determine which of the following options is diploid, we need to understand the definition of diploid and analyze the provided options.

### Step-by-Step Solution:

1. **Understand the Definition of Diploid**:
- Diploid organisms have two complete sets of chromosomes, denoted as 2n. In humans, this means 46 chromosomes (23 pairs).

2. **Analyze the Options**:
- The options provided are:
- A) Primary oocyte
- B) Oogonium
- C) Secondary oocyte

3. **Examine Each Option**:
- **A) Primary Oocyte**:
- The primary oocyte is formed from the oogonium and is diploid (2n), meaning it has 46 chromosomes.
- **B) Oogonium**:
- The oogonium is the initial germ cell that is also diploid (2n) and has 46 chromosomes.
- **C) Secondary Oocyte**:
- The secondary oocyte is formed after the first meiotic division of the primary oocyte and is haploid (n), meaning it has only 23 chromosomes.

4. **Conclusion**:
- From the analysis, both the primary oocyte and the oogonium are diploid (2n).
- The secondary oocyte is not diploid as it is haploid (n).

5. **Final Answer**:
- The correct answer is that both A (Primary oocyte) and B (Oogonium) are diploid.