one of two identical strands into which a chromosome splits during mitosis
chromatid详细解释
chro.ma.tid n.（名词）Either of the two daughter strands of a duplicated chromosome that are joined by a single centromere and separate during cell division to become individual chromosomes.染色单体：染色体复制产生的两个单体中的一个，由细胞分裂过程中染色体在一个着丝点上分裂形成单个染色体
