Separation of chromatids during anaphase .
spindle
The spindle apparatus becomes visible after stage two of mitosis. (I'm trying to remember from biology class, so i could be wrong!)
the centromere keeps the two sister chromatids together. its also where the chromosome attaches to the spindle apparatus during mitosis and meiosis.
I assume you mean centrosome, not cemtrosome. The centrosome is a microtubule organizing center made up of two centrioles. In mitosis, it creates spindle apparatus microtubules, which are then used to separate the chromosomes into the two daughter cells. It is worth noting that a centrosome is not required to create the spindle.
Metaphase is when chromosomes attatch to spindle fibers in the phase of mitosis.
Telophase
Spindle
centriols
Centrioles. They are visible during metaphase, the second stage of mitosis. Added: Centrosomes. Centrioles are present in animal cells but are, seemingly, not needed to mount a spindle apparatus. Plant cells get along very well without centrioles.
Microtubules
During mitosis a double-stranded chromosome attaches to a spindle fiber centromere.
Inspite of the absene of centrioles,the centromere can organise spindle which is an apparatus for mitosisto take place.Thus,the centromere functions in the absence of the centriole.