Either of the two longitudinally adjacent threads formed when a eukaryotic chromosome replicates prior to mitosis. The chromatids are held together at the centromere. Sister chromatids are derived from the same chromosome. (Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)
    

concept

Chromosomes

Human chromosomes and spindle at anaphase

Human chromosomes and spindle at metaphase

Chromosomes and spindle at metaphase

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Human chromosomes and spindle at metaphase

Human chromosomes and spindle at anaphase

Chromosomes and spindle at metaphase

Human chromosomes and spindle at metaphase

Chromosomes