उत्तर : 2. "Metaphase"
व्याख्या :

Answer: B) Metaphase Explanation: A chromatid is one copy of a newly copied chromosome which is still joined to the original chromosome by a single centromere. The two identical copies—each forming one half of the replicated chromosome are called chromatids. Chromonema is the fibre-like structure in prophase in the primary stage of DNA condensation. In metaphase, they are called chromatids.