Dikaryophase/ Dikaryon formation is particularly a charactericstic feature of

Options

A. all fungi
B. oomycetes and ascomycetes
C. ascomycetes and basidiomycetes
D. only basidiomycetes

Answer

To solve the question about dikaryophase or dikaryon formation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Dikaryon Formation**:
- A dikaryon is a cell that contains two distinct nuclei. This occurs in certain fungi during their reproductive cycle.

2. **Identifying Fungal Groups**:
- The question provides four options related to different groups of fungi:
- A) All fungi
- B) Oomycetes and Ascomycetes
- C) Ascomycetes and Basidiomycetes
- D) Only Basidiomycetes

3. **Analyzing Karyogamy**:
- In fungi, karyogamy (the fusion of nuclei) is delayed in certain groups. This delay allows for the presence of a dikaryotic phase, where cells have two nuclei.

4. **Recognizing Relevant Fungal Groups**:
- The two main groups of fungi where dikaryon formation is characteristic are:
- **Ascomycetes**: Known for having a dikaryotic phase during their life cycle.
- **Basidiomycetes**: Also exhibit dikaryon formation, particularly during their reproductive phase.

5. **Eliminating Incorrect Options**:
- **Option A (All fungi)**: Incorrect, as not all fungi exhibit dikaryon formation.
- **Option B (Oomycetes and Ascomycetes)**: Incorrect, as oomycetes do not typically exhibit dikaryon formation.
- **Option D (Only Basidiomycetes)**: Incorrect, as Ascomycetes also exhibit this feature.

6. **Final Answer**:
- The correct answer is **Option C (Ascomycetes and Basidiomycetes)**, as both groups are known for dikaryon formation.