Gametic meiosis occurs in protists which are

Options

A. Diploid
B. Haploid
C. Tetraploid
D. Mesokaryotic

Answer

To determine which type of protists undergo gametic meiosis, we need to analyze the options provided and understand the concept of gametic meiosis in relation to the life cycles of protists.

### Step-by-Step Solution:

1. **Understand Gametic Meiosis**:
- Gametic meiosis is a type of meiosis that occurs in diploid organisms where the zygote (2n) undergoes meiosis to produce haploid gametes (n).

2. **Identify the Life Cycles**:
- There are two primary life cycles in organisms: haplontic and diplontic.
- In a **haplontic life cycle**, the dominant stage is haploid (n), and meiosis occurs to produce spores.
- In a **diplontic life cycle**, the dominant stage is diploid (2n), and meiosis occurs to produce gametes.

3. **Evaluate the Options**:
- **Option 1: Diploid** - This is correct because gametic meiosis occurs in diploid organisms, producing haploid gametes.
- **Option 2: Haploid** - This is incorrect because in haploid organisms, meiosis does not produce gametes; instead, it produces spores.
- **Option 3: Tetraploid** - This is incorrect because tetraploid organisms would not produce haploid gametes directly through meiosis.
- **Option 4: Mesokaryotic** - This term is not commonly used in the context of protist classification and does not apply here.

4. **Conclusion**:
- The correct answer is that gametic meiosis occurs in protists that are **diploid**.

### Final Answer:
**Gametic meiosis occurs in protists which are diploid.**

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