Chiasma represents the site of

Options

A. homologous chromosome
B. crossing over
C. pachytene
D. diakinesis

Answer

**Step-by-Step Solution:**

1. **Understanding Chiasma**: Chiasma is a term used in genetics to describe the point where two homologous chromosomes exchange genetic material during meiosis.

2. **Location of Chiasma**: Chiasma forms during the prophase stage of meiosis, specifically in the subphase known as pachytene. This is when homologous chromosomes are closely aligned.

3. **Crossing Over Process**: During the pachytene stage, genetic material is exchanged between non-sister chromatids of homologous chromosomes. This exchange of genetic material is known as crossing over.

4. **Visibility of Chiasma**: Chiasma becomes visible during the diplotene stage of prophase I of meiosis, after the crossing over has occurred.

5. **Conclusion**: Therefore, chiasma represents the site of crossing over between homologous chromosomes, which is crucial for genetic diversity.

**Final Answer**: Chiasma represents the site of crossing over between homologous chromosomes.

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