Which of the following correctly compares the events of Metaphase I to Metaphase II in meiosis?

• A. In both Metaphase I and Metaphase II, homologous chromosomes line up at the equatorial plate.
• B. In both Metaphase I and Metaphase II, sister chromatids line up at the equatorial plate.
• C. In Metaphase I, homologous chromosomes line up at the equatorial plate, while in Metaphase II, sister chromatids line up at the equatorial plate.
• D. In Metaphase I, sister chromatids line up at the equatorial plate, while in Metaphase II, homologous chromosomes line up at the equatorial plate.

Answer: (C)

Verified step by step guidance

1. Understand the stages of meiosis: Meiosis consists of two consecutive divisions, Meiosis I and Meiosis II, each with its own phases: Prophase, Metaphase, Anaphase, and Telophase.
2. Focus on Metaphase I: During Metaphase I, homologous chromosomes (pairs of chromosomes, one from each parent) line up at the equatorial plate. This is a key event that distinguishes Metaphase I from Metaphase II.
3. Focus on Metaphase II: In Metaphase II, the chromosomes that were separated during Meiosis I are now composed of sister chromatids. These sister chromatids line up at the equatorial plate during Metaphase II.
4. Compare the alignment: In Metaphase I, the alignment involves homologous chromosomes, whereas in Metaphase II, the alignment involves sister chromatids. This difference is crucial for understanding the progression and purpose of meiosis.
5. Select the correct comparison: Based on the understanding of the alignment in Metaphase I and Metaphase II, identify the statement that accurately describes these events. The correct statement is: 'In Metaphase I, homologous chromosomes line up at the equatorial plate, while in Metaphase II, sister chromatids line up at the equatorial plate.'