A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 12 picograms of DNA per nucleus.How many picograms of DNA would be found in a nucleus at the end of G₁ and the end of G₂? A)12;12 B)12;24 C)24;12 D)24;24

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Quizplus · Accepted Answer

During G1 phase, the cell prepares for DNA replication by producing essential enzymes and proteins. It does not duplicate its DNA yet, so the amount of DNA remains 12 picograms. During S phase, the DNA replication occurs, resulting in the duplication of DNA. Therefore, at the end of S phase, the amount of DNA in the nucleus is 24 picograms. During G2 phase, the cell prepares for cell division, and the DNA amount remains 24 picograms. Therefore, at the end of G2 before entering into mitosis, the amount of DNA would still be 24 picograms.

A Group of Cells Is Assayed for DNA Content Immediately