Question

which event occurs during meiosis ii but not during meiosis i? a) sister chromatids are pulled to opposite poles b) spindle apparatus forms inside the cell c) cytokinesis occurs after the final phase d) haploid number of chromosomes line the equator

Explanation:

• Meiosis I: Homologous chromosomes separate. The key events include homologous chromosome pairing, crossing - over, and separation of homologous chromosomes. The chromosome number is reduced from diploid to haploid.
• Meiosis II: It is similar to mitosis. Sister chromatids separate.
• Option A: In meiosis I, homologous chromosomes are pulled to opposite poles. In meiosis II, sister chromatids are pulled to opposite poles.
• Option B: Spindle apparatus forms in both meiosis I (prophase I) and meiosis II (prophase II).
• Option C: Cytokinesis occurs after telophase I (meiosis I) and telophase II (meiosis II).
• Option D: In meiosis I, diploid (paired homologous) chromosomes line up at the equator (metaphase I). In meiosis II, haploid (sister - chromatid - containing) chromosomes line up at the equator (metaphase II). But the separation of sister chromatids (anaphase II) is the event that is unique compared to meiosis I (where homologous chromosomes separate).

Answer:

A. sister chromatids are pulled to opposite poles