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- Metaphase ends and anaphase
- begins as the centromeres of each pair
- of chromatids split, effectively
- doubling the number of chromosomes.
- Once separated, sister chromatids, each
- now an independent chromosome with
- its own centromere, begin moving apart
- toward opposite poles of the cell. The
- movement is made possible via two
- mechanisms. The kinetochore fibers
- attached to each centromere begin to
- shorten, pulling the chromosomes
- toward the poles. At the same time,
- the polar microtubules from opposite
- ends of the cell form cross bridges in
- the equatorial plane, pushing the poles
- apart by becoming longer. In telophase,
- the spindle apparatus disappears, a nuclear
-
-