A centromere is the chromosome region where a kinetochore assembles.[ref]
The Process of Meiosis. Biology 2e by Mary Ann Clark and others; §11.1, Prometaphase I, kinetochore proteins at centromeres
Following DNA replication, both sister chromatids have their own copied centromere regions; the counting convention groups the attached sisters as one replicated chromosome. Cohesin maintains sister association: a centromere is not an extra DNA bridge joining two separate DNA molecules.[ref]Cell Division. Biology 2e by Mary Ann Clark and others; §10.1, Eukaryotic Chromosomal Structure and Compaction, final paragraph, centromeric region and cohesin
New to topics? Read the docs here!