Biology

The diagram refers to a Chromatid.

Explanation:

B.Chromatid refers to a single, unreplicated DNA strand that, after DNA replication, will pair up with its identical copy to form sister chromatids. Before replication or at the early stages of cell division, a single chromatid is visible as a thin, elongated structure with a centromere in the middle. It is not yet in the "X" shape, which forms when the two sister chromatids come together during later stages of cell division.

A.Sister chromatids are two identical chromatids connected by a centromere after DNA replication, and they ...