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Multiple Choice
A new spindle apparatus begins to form in two separate haploid cells during which stage of meiosis?
A
Prophase II
B
Metaphase I
C
Anaphase II
D
Telophase I
Verified step by step guidance
1
Understand the context of meiosis: Meiosis is a type of cell division that reduces the chromosome number by half, producing four haploid cells. It consists of two stages: Meiosis I and Meiosis II, each with their own sub-stages (Prophase, Metaphase, Anaphase, and Telophase).
Recall the events of Prophase II: During Prophase II, a new spindle apparatus begins to form in each of the haploid cells produced at the end of Meiosis I. This spindle is essential for separating sister chromatids during the subsequent stages of Meiosis II.
Differentiate between the stages: In Metaphase I, homologous chromosomes align at the metaphase plate. In Anaphase II, sister chromatids are pulled apart. In Telophase I, the nuclear envelope reforms around the separated homologous chromosomes, and the cells transition into haploid states. None of these stages involve the formation of a new spindle apparatus.
Focus on the key detail: The formation of a new spindle apparatus specifically occurs in Prophase II, as it is necessary for the proper alignment and separation of sister chromatids during Meiosis II.
Conclude the reasoning: Based on the above analysis, the correct stage where a new spindle apparatus begins to form in two separate haploid cells is Prophase II.