Concept
Version 11
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The Mitotic Phase and the G0 Phase
Kinetochore and Mitotic Spindle
During prometaphase, mitotic spindle microtubules from opposite poles attach to each sister chromatid at the kinetochore. In anaphase, the connection between the sister chromatids breaks down and the microtubules pull the chromosomes toward opposite poles.
Source
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"OpenStax College, The Cell Cycle. October 16, 2013."
http://cnx.org/content/m44460/latest/Figure_10_02_03.jpg
OpenStax CNX
CC BY 3.0.