Multiple Choice
Which of the following sentences describes something that happens during prophase?
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11. Cell Division
Introduction to Cell Division
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During which phase does a spindle form in a haploid cell?
A
Telophase I
B
Prophase II
C
Anaphase II
D
Metaphase I
Verified step by step guidance1
Understand the context: The question is asking about the phase during which the spindle forms in a haploid cell. This occurs during meiosis, a type of cell division that reduces the chromosome number by half and involves two rounds: Meiosis I and Meiosis II.
Recall the key events of meiosis: In Meiosis I, homologous chromosomes are separated, resulting in haploid cells. In Meiosis II, the sister chromatids of each chromosome are separated. Spindle formation is crucial for chromosome movement during these phases.
Focus on Prophase II: After Meiosis I, the resulting cells are haploid. During Prophase II, the spindle apparatus begins to form again in preparation for the separation of sister chromatids in Meiosis II.
Eliminate incorrect options: Telophase I is the final stage of Meiosis I, where the nuclear envelope reforms, and no spindle formation occurs. Anaphase II is when sister chromatids are pulled apart, so the spindle is already formed by this stage. Metaphase I occurs in Meiosis I, where homologous chromosomes align at the metaphase plate, but the cell is still diploid at this point.
Conclude that the correct answer is Prophase II, as this is the phase in a haploid cell where the spindle forms in preparation for the separation of sister chromatids.
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