In meiosis I at equator, which of the following is found?

Options

A. bivalent
B. univalents
C. chromatids separate
D. none of these

Answer

**Step-by-Step Solution:**

1. **Understanding Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half and leads to the formation of gametes (sperm and eggs). It consists of two main stages: Meiosis I and Meiosis II.

2. **Identifying Meiosis I**: Meiosis I is known as a reductional division because it reduces the chromosome number from diploid (2n) to haploid (n). This is crucial for sexual reproduction.

3. **Phases of Meiosis I**: Meiosis I includes several phases: prophase I, metaphase I, anaphase I, and telophase I. During prophase I, homologous chromosomes pair up and exchange genetic material through a process called crossing over.

4. **Formation of Bivalents**: During prophase I, homologous chromosomes come together to form structures called bivalents (or tetrads). Each bivalent consists of two homologous chromosomes, which means it contains four sister chromatids.

5. **Metaphase I**: In metaphase I, these bivalents align along the metaphase plate (equator of the cell). This alignment is crucial for the subsequent separation of homologous chromosomes.

6. **Options Analysis**: The question asks what is found at the equator during meiosis I. The options given are:
- Bivalent
- Univalent
- Chromatid separates
- None of these

7. **Correct Answer**: At the equator during metaphase I, bivalents are found as they align for separation. Therefore, the correct answer is **bivalent**.

8. **Elimination of Other Options**:
- **Univalent**: This refers to a single chromosome and is not applicable during metaphase I when bivalents are present.
- **Chromatid separates**: Chromatids do not separate at the equator; they separate during anaphase I.
- **None of these**: This option is incorrect since bivalents are indeed present.

**Final Answer**: At the equator during meiosis I, **bivalents** are found.

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