A Levels Biology (9700)•9700/12/O/N/21
Explanation
Cell cycle stages with 2C DNA content
Steps:
- Post-mitosis and cytokinesis produces daughter cells with 2C DNA, matching G1 phase (one DNA molecule per chromosome).
- Stage 1 shows G1 interphase cell with 2C DNA.
- Stages 2 and 4 show individual daughter cells post-cytokinesis, each with 2C DNA.
- Stage 3 shows G2 or mitotic cell with 4C DNA (two DNA molecules per chromosome).
Why A is correct:
- Selects stages 1, 2, and 4, all containing 2C DNA as defined by the haploid genome content (C) doubled in diploid cells post-division.
Why the others are wrong:
- B includes stage 3 with 4C DNA, exceeding post-mitosis amount.
- C omits stages 2 and 4, excluding post-cytokinesis cells with 2C DNA.
- D omits stage 1, excluding the G1 interphase cell with 2C DNA.
Final answer: A
Topic: Replication and division of nuclei and cells
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