In synapsis, two homologous chromosomes are connected at

Options

A. Centromeres
B. Chromomeres
C. Telomeres
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Synapsis**: Synapsis is a crucial process that occurs during meiosis, where homologous chromosomes pair up. This pairing is essential for genetic recombination.

2. **Identifying Homologous Chromosomes**: Homologous chromosomes are pairs of chromosomes that contain the same genes in the same order, but may have different alleles. They are similar in structure and size.

3. **Formation of Bivalents**: During synapsis, homologous chromosomes come together to form a structure called a bivalent or tetrad. This structure consists of four chromatids (two from each homologous chromosome).

4. **Connection Points**: The question asks where these homologous chromosomes are connected during synapsis. The connection occurs at specific points on the chromosomes.

5. **Evaluating Options**:
- **Centromeres**: The centromere is the region of a chromosome where the two sister chromatids are joined together. It is also where homologous chromosomes align during synapsis.
- **Chromomeres**: These are bead-like structures along the chromosome that are not the points of connection during synapsis.
- **Telomeres**: These are the ends of chromosomes and do not play a role in the connection of homologous chromosomes during synapsis.
- **None of the Above**: This option implies that none of the previous answers are correct.

6. **Conclusion**: Based on the understanding that homologous chromosomes are connected at their centromeres during synapsis, the correct answer is **Option 1: Centromeres**.

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