Microtubules, appearing around centriole pair in the beginning of prophase in animal cells form

Spindle

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Aster

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Spindle pole

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Chromosome fibres

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Solution

The correct option is B Aster
Asters initially appear in prophase. They form around each centriole pair. Asters organize spindle fibers that extend from the cell poles and fibers that attach to chromosomes at their kinetochores. This separation is accomplished as spindle fibers shorten, pulling attached chromatids along with them.

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