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In the somatic cell cycle:

1. In G1 phase DNA content is double the amount of DNA present in the original cell
2. DNA replication takes place in S-phase
3. A short interphase is followed by a long mitotic phase
4. G2 phase follows mitotic phase

Correct answer: DNA replication takes place in S-phase

Solution

S phase is the synthesis phase of interphase, and it is when DNA is replicated. The other options misstate the amount of DNA in G1 or the order and length of cell-cycle phases.

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