Sister chromatid

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noun, plural: sister chromatids

Any of the two chromatids joined together by a common centromere.


A sister chromatid may also be said as 'one-half' of the duplicated chromosome. It is one of the two identical copies of DNA making up a chromosome.

Word origin: Greek khrōma, khrōmat-, color.

Related terms: sister chromatid exchange.

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