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Spindle fibers are necessary in mitosis as they help in bringing half the number of chromosomes on each side of the cell, so that when the cell divides, the chromosomes are distributed equally in both the daughter nuclei.
During mitosis a double-stranded chromosome attaches to a spindle fiber centromere.
The answer is telophase.
Chromosomes attach to the mitotic spindle during the metaphase of mitosis. Part of the answer depends on how you define the stages of mitosis and not everybody does this the same way. The short answer is all of them.
Separation of chromatids during anaphase .
spindle
the spindle fibers
Spindle fibres attach to the centrimeres(the middle part of the chromosome which holds it together) of the chromosomes, then contract to pull them apart.
Spindle Fibers
the spindle
Centrioles
kinetochore microtubules bind with spindle fibers.