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chromatid
Each of the 2 strands formed by duplication of a chromosome. Chromatid become visible during prophase of meiosis or mitosis. The 2 chromatids are connected by the centromere. During metaphase, the centromeres separate & the chromatids become chromosomes.
Related
chromatin
chromosome
General
macromolecular complex
References
Stedman's Medical Dictionary 27th ed, Williams &
Wilkins, Baltimore, 1999.