The chromatids are attached to each other at the Centromere.
Hope that helps have a nice day.
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that would be the centromere
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The Centromere, use the wiki article for further reading.
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one word Centromere
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The two chromatids of a chromosome are attached at a point
called the centromere. It is the point which it is attached to a
spindle fiber during the process of cell division.