Beads on string like structures of A are seen in B, which further condense to form chromosomes in C stage of cell division.

            A                   B                   C

(a) Chromonema  Chromatin       Metaphase

(b) Chromatin      Chromatid       Metaphase

(c) Chromonema  Chromosome    Anaphase

(d) Chromonema  Chromatid       Anaphase.

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