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(1) Chromatid. One of the two identical parts of the chromosome after S phase. (2) Centromere. The point where the two chromatids touch, and where the microtubules attach. (3) Short arm (4) Long arm.
A chromatid is one of a pair of duplicated chromosomes produced during the S phase of the cell cycle, which are joined together at the centromere. Chromatids become visible during prophase and metaphase of mitosis or meiosis. They separate at anaphase and are then known as daughter chromosomes.

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