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A group of cells is assayed for DNA content immediately following mitosis (G1) and is found to have an average of 8 picograms of DNA per nucleus. How many picograms would be found at the end of S, and the end of G2 for this cell type

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Answer:

16 pg at the end of S

16 pg at the end of G2

Explanation:

A cell has 8 pg of DNA per nucleus in G1.

During S phase the DNA replicates, so every nucleus will contain double the normal amount of DNA that was present in G1. Therefore, at the end of S each nucleus would have 16 pg of DNA.

During G2 the cell continues growing and preparing for mitosis, but DNA content does not change: there are still 16 pg per nucleus.

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