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a
During prophase nuclear envelope develops around the chromosome clusters at each pole forming two daughter nuclei.
b
The complete disintegration of the nuclear envelope marks the start of prophase
c
The plane of alignment of the chromosomes at anaphase is referred to as the metaphase plate.
d
During telophase chromosomes that have reached their respective poles decondense and lose their individuality.
answer is D.
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Detailed Solution
At the beginning of telophase, the chromosomes that have reached their respective poles decondense and lose their individuality. The individual chromosomes can no longer be seen and each set of chromatin material tends to collect at each of the two poles.