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Beginning and end of second interphase period

Which events mark the beginning and end of second interphase period? What takes place in the cell during this period?

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Second interphase period is S. It starts with the commencement of DNA reproduction and finishes with end of that process. The major event in this period is the synthesis of fresh polynucleotide chains, each and every bound to each and every DNA chain which served as a template, that is, the duplication of the unusual set of the DNA molecules.

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