The number of molecules of DNA in a cell in the G1 stage of the cell cycle is 20. The expected number of molecules in the same cell in the G2 stage of the cell cycle would be
Question
The number of molecules of DNA in a cell in the G1 stage of the cell cycle is 20. The expected number of molecules in the same cell in the G2 stage of the cell cycle would be
Solution
The G1 stage of the cell cycle is the first phase of interphase, where the cell grows and prepares for DNA replication. The G2 stage is the third phase of interphase, after DNA replication has occurred.
In the G1 stage, the cell has a single set of chromosomes, each consisting of one DNA molecule. Therefore, if a cell has 20 molecules of DNA in the G1 stage, it means it has 20 chromosomes.
During the S (synthesis) phase, which occurs between G1 and G2, each chromosome is replicated to produce two identical sister chromatids. Each chromatid is a separate DNA molecule. Therefore, after DNA replication, the number of DNA molecules doubles.
So, if a cell has 20 DNA molecules (or chromosomes) in the G1 stage, it would have 2 * 20 = 40 DNA molecules in the G2 stage.
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