Which characteristic seen in prophase I does NOT occur in prophase II?Crossing over occurs.Spindle formation occurs.The number of chromosomes doubles.Chromosomes move to the middle of the cell.
Question
Which characteristic seen in prophase I does NOT occur in prophase II?Crossing over occurs.Spindle formation occurs.The number of chromosomes doubles.Chromosomes move to the middle of the cell.
Solution
The characteristic seen in prophase I that does NOT occur in prophase II is "The number of chromosomes doubles."
Here's why:
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Crossing over occurs: This is a characteristic of prophase I, not prophase II. During prophase I, homologous chromosomes pair up and exchange segments in a process called crossing over. This does not happen in prophase II.
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Spindle formation occurs: This happens in both prophase I and prophase II. The spindle is a structure that helps separate the chromosomes during cell division.
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The number of chromosomes doubles: This is NOT a characteristic of either prophase I or prophase II. The number of chromosomes remains the same in these stages. The doubling of chromosomes occurs earlier, during the S phase of the cell cycle.
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Chromosomes move to the middle of the cell: This happens in both prophase I and prophase II. The chromosomes align at the equator of the cell in preparation for separation.
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