Question

During eukaryotic cell division, the amount of DNA doubles

• A. between prophase and anaphase of mitosis
• B. between prophase I and prophase II of meiosis
• C. between the G1 and G2 phases of the cell cycle
• D. during the M phase of the cell cycle

Hint:

DNA replication occurs only in S phase — never during mitosis or meiosis themselves.

Answer 1

The Correct Option is C

Step 1: Recall phases of the eukaryotic cell cycle.
Between G1 and G2 lies the S phase (synthesis phase), where DNA replication occurs. This results in doubling of the DNA content, even though chromosome number remains the same.
Step 2: Check each option.
(A) Incorrect — mitosis involves separation of already replicated DNA.
(B) Incorrect — DNA replication occurs before meiosis I, not between prophase I and II.
(C) Correct — DNA replication takes place in S phase located between G1 and G2.
(D) Incorrect — M phase involves division, not DNA doubling.
Step 3: Conclusion.
Thus, DNA doubling occurs between G1 and G2.