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Can someone please explain in detail how to do this problem? The DNA strand bit always...

Can someone please explain in detail how to do this problem? The DNA strand bit always gets me.

A cell has 40 strands of DNA present at G2. What is the 'n-value' of the genome?

a. 40

b. 20

c. 10

d. impossible to tell with these data.

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Answer #1

Answer: Option C is correct.
Explanation:
Cell cycle progression = G1-S-G2-M
DNA replication occurs in the S-phase. So, G2 cell contains double the amount of DNA.
1 DNA molecule = 2 DNA strands.
40 DNA strands = 20 DNA molecules
If the cell contains 20 DNA molecules in G2, it means that it has 10 DNA molecules in the G1.
i.e. n value of the genome = 10

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