https://doi.org/10.1351/goldbook.10523
One of a pair of chromosomes arising by duplication during mitosis or by pairing during meiosis, and joined together at the centromere.
Note: Sister chromatid refers to either one of the joined pair arising from the same chromosome by duplication, and non-sister chromatid refers to either of the joined homologous chromosomes of maternal or paternal origin arising during meiosis.