A) Breaking down the nuclear membrane during prophase
B) Helping homologous chromosomes to pair and form bivalents
C) Holding the two chromatids of a chromosome together
D) Organising microtubules to form spindle fibers
Correct Answer: D
Solution :
Centrioles migrate to the poles at mid prophase-I and start to form the spindle fibres at late prophase-I.
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