Which of the following is the correct sequence of 3 steps in the sexual cycle of fungi-

Options

A. Mitosis `rarr` Meiosis `rarr` Fertilization
B. Plasmogamy `rarr` Karyogamy `rarr` Meiosis
C. Meiosis `rarr` Plasmogamy `rarr` Karyogamy
D. Karyogamy `rarr` Plasmogamy `rarr` Meiosis

Answer

To answer the question regarding the correct sequence of steps in the sexual cycle of fungi, we need to understand the key processes involved in fungal reproduction. The sexual reproduction cycle of fungi typically involves several distinct stages. Here’s a step-by-step breakdown:

### Step 1: Plasmogamy
- **Explanation**: This is the first step in the sexual cycle of fungi where two compatible fungal hyphae (the filamentous structures of fungi) come together and fuse their cytoplasm. This fusion results in a dikaryotic cell, which contains two distinct nuclei from the parent fungi.

### Step 2: Karyogamy
- **Explanation**: Following plasmogamy, karyogamy occurs. This is the process where the two nuclei within the dikaryotic cell fuse to form a diploid nucleus. This step is crucial as it leads to the formation of a zygote.

### Step 3: Meiosis
- **Explanation**: The final step in the sexual cycle is meiosis. This process reduces the diploid zygote back to haploid spores, which can then germinate and grow into new fungal hyphae, continuing the life cycle.

### Correct Sequence
Thus, the correct sequence of the three steps in the sexual cycle of fungi is:
1. Plasmogamy
2. Karyogamy
3. Meiosis