Identify CORRECTLY matched pair.

Options

A. Zygotene -Pairing of homologous chromosomes
B. Pachytene-Disjunction of hi homologous chromosomes
C. Diakinesis-Recombination of non sister chromatids of homologous chromosomes
D. Diplotene-Nucleolus disappears

Answer

To solve the question of identifying the correctly matched pair, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding Zygotein**:
- Zygotein is a stage in prophase I of meiosis where homologous chromosomes pair up. This process is known as synapsis.
- **Match**: Zygotein - Pairing of homologous chromosomes (Correct).

2. **Understanding Pachytene**:
- Pachytene is another stage in prophase I where crossing over occurs between non-sister chromatids of homologous chromosomes.
- The term "disjunction" refers to the separation of homologous chromosomes, which occurs during anaphase I.
- **Match**: Pachytene - Disjunction of homologous chromosomes (Incorrect).

3. **Understanding Diplotene**:
- Diplotene is a stage in prophase I where homologous chromosomes begin to separate but remain attached at chiasmata.
- The nucleolus disappears during the diakinesis stage, not during diplotene.
- **Match**: Diplotene - Nucleolus disappears (Incorrect).

4. **Understanding Diakinesis**:
- Diakinesis is the final stage of prophase I where the chromosomes condense further, and the nucleolus disappears.
- The recombination of non-sister chromatids occurs during the pachytene stage.
- **Match**: Diakinesis - Recombination of non-sister chromatids (Incorrect).

### Conclusion:
The only correctly matched pair is:
- **Zygotein - Pairing of homologous chromosomes**.

Thus, the correct answer is the first option.