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Definition

noun, singular: sister chromatid

Two identical strands joined by a common centromere as a result of a chromosome that duplicated during the S phase of the cell cycle.

Supplement

Sister chromatids are separated during mitosis so that the two daughter cells would have identical sets of chromosomes.

Word origin: Greek khrōma, khrōmat-, color.

Compare: non-sister chromatid.
See also: centromere, chromatid.