noun
chromatid
Technical term in genetics and cell biology; refers to one of the two identical halves of a replicated chromosome.
染色分体は細胞分裂の際に分離する。
Chromatids separate during cell division.
染色体 (chromosome) is the entire structure; 染色分体 (chromatid) is one half of a duplicated chromosome.
Compound of 染色 (staining) + 分体 (divided body), a calque from the biological term chromatid.