In the prophase stage of cell division, chromosome replication does not occur so option d. chromosome replicate themselves is the correct answer.
Following events occur at prophase stage of the cell cycle-
- Chromatin condenses into well defined chromosomes.
- Each chromosome consist of two sister chromatids that are held together at centromere.
- Nucleolus disappears.
- Disruption of nuclear envelope occurs.
Correct option-
d. Chromosome replicate themselves-this does not occur during prophase. The chromosomes are duplicated in the S phase of the interphase.
Incorrect options-
a. Identifiable chromosome appears -this occurs at prophase stage. In prophase stage each chromosome consist of two sister chromatids.
b. The nuclear envelope begins to fragment-this occurs at prophase stage. The fragmentation of nuclear envelope occurs in prophase stage.
c. Chromatin in the nucleus condenses-this occurs during prophase. The chromatin which is diffuse in interphase, condenses into well defined chromosomes in prophase stage.
Learn more about prophase-
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