A chromosome may contain one or two chromatids in different phases of the mitotic or meiotic cell cycle.

Question

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During the S-phase of cell cycle, the chromosome is replicated to form two identical sister chromatids held together by a centromere. These chromatids may separate during mitosis or meiosis, resulting in each daughter cell receiving one chromatid (haploid cells) or two chromatids (diploid cells). Therefore, a chromosome may contain one or two chromatids depending on the phase of the cell cycle.

A Chromosome May Contain One or Two Chromatids in Different