Chromosomes of the bivalent lie very close to each other and far separated from each other, respectively during

Options

A. Zygotene and diakinesis
B. Leptotene and anaphase-I
C. Leptotene and diplotene
D. Anaphase-I and anaphase-II

Answer

To answer the question regarding when chromosomes of the bivalent lie very close to each other and when they are far separated, we can break down the phases of meiosis involved:

1. **Understanding Bivalents**: Bivalents are formed during prophase I of meiosis when homologous chromosomes pair up. This pairing occurs in a specific sequence of stages.

2. **Zygotene Phase**: In the zygotene stage of prophase I, homologous chromosomes come together and begin to pair up closely, forming bivalents. At this stage, the chromosomes are indeed very close to each other.

3. **Diakinesis Phase**: As prophase I progresses to diakinesis, the bivalents prepare for separation. During diakinesis, the chromosomes condense further, and the bivalents are still present, but they are positioned in such a way that they are far apart from each other, ready for the next stages of meiosis.

4. **Conclusion**: Therefore, the correct answer to the question is that chromosomes of the bivalent lie very close to each other during the **zygotene phase** and are far separated during the **diakinesis phase**.

### Final Answer:
Chromosomes of the bivalent lie very close to each other during the zygotene phase and are far separated during the diakinesis phase.

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