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B
Spindle formation
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C
Crossing over
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D
Chromosome duplication
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Solution
The correct option is C Crossing over Chromosomal crossover is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes. It is one of the final phases of genetic recombination, which occurs during prophase I of meiosis (pachytene) during a process called as synapsis.