Ascus in ascomycetes contains 8 ascospores. These are formed as a result of

Options

A. two meiosis
B. one meiosis and one mitosis
C. four mitosis
D. one meiosis and two mitosis

Answer

### Step-by-Step Solution:

1. **Understanding the Structure**: The Ascus is a specialized structure found in Ascomycetes, a group within the kingdom Fungi. It is responsible for the production of ascospores.

2. **Number of Ascospores**: Each Ascus typically contains eight ascospores.

3. **Cell Division Types**: The formation of these eight ascospores involves two types of cell divisions: meiosis and mitosis.

4. **Meiosis Process**:
- **First Division (Reductional Division)**: In the first meiotic division, the chromosome number is halved. If the parent cell has a diploid chromosome number (2n), the two resulting daughter cells will have a haploid chromosome number (n).
- **Second Division (Equational Division)**: The two daughter cells from the first meiotic division undergo a second division, which is equational. This division does not reduce the chromosome number but instead produces four haploid daughter cells.

5. **Mitosis Process**: After the meiotic divisions, the four haploid daughter cells undergo mitosis. Each of these four cells divides, resulting in a total of eight haploid ascospores.

6. **Final Count**: Therefore, the total number of ascospores produced in the Ascus is eight, which results from one meiosis (comprising two divisions) followed by one mitosis.

7. **Conclusion**: The formation of eight ascospores in the Ascus occurs as a result of **1 meiosis and 1 mitosis**.

### Final Answer:
The eight ascospores in the Ascus of Ascomycetes are formed as a result of **1 meiosis and 1 mitosis**.

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