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Multiple Choice
All of the following events occur during prophase except:
A
Condensation of chromatin into visible chromosomes
B
Disintegration of the nuclear envelope
C
Alignment of chromosomes at the metaphase plate
D
Separation of centrosomes and formation of the mitotic spindle
Verified step by step guidance
1
Understand the stages of mitosis: Prophase, Metaphase, Anaphase, and Telophase. Each stage has distinct events. Prophase is the first stage where preparatory changes occur for chromosome segregation.
Recall the key events of prophase: (1) Chromatin condenses into visible chromosomes, (2) The nuclear envelope begins to break down, and (3) Centrosomes separate and the mitotic spindle forms.
Identify the event that does not occur during prophase. The alignment of chromosomes at the metaphase plate is a hallmark of metaphase, not prophase.
Compare the listed events with the characteristics of prophase. Condensation of chromatin, disintegration of the nuclear envelope, and spindle formation are all consistent with prophase.
Conclude that the event 'Alignment of chromosomes at the metaphase plate' does not occur during prophase, as it is specific to metaphase.