The number of DNA strands (chromatids) in a c | vedclass

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(B) During the $S$-phase (Synthesis phase) of the cell cycle,$DNA$ replication occurs,which doubles the amount of $DNA$ per chromosome.In the $G_{1}$-

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(B) During the $S$-phase (Synthesis phase) of the cell cycle,$DNA$ replication occurs,which doubles the amount of $DNA$ per chromosome.In the $G_{1}$-phase,each chromosome consists of a single chromatid (one $DNA$ molecule).After $DNA$ replication in the $S$-phase,each chromosome consists of two sister chromatids,each containing one $DNA$ molecule.Therefore,at the $G_{2}$-stage,each chromosome contains two $DNA$ strands (chromatids) held together by a centromere.

The number of $DNA$ strands (chromatids) in a chromosome at the $G_{2}$-stage is:

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