Question
Choose the three cell-cycle stages in which ordinary light microscopy does not resolve separate, condensed chromosomes. Select one group.A. The final stage of mitosis (telophase), cytoplasmic division (cytokinesis), and the resting state G0B. The first gap (G1), DNA synthesis (S), and the second gap (G2)C. DNA synthesis (S), the mitotic phase (M), and the resting state G0D. The first three named stages of mitosis: prophase, metaphase, and anaphase
Answer
B. G1, S, and G2 is the intended answer. Across these three stages, DNA is present as comparatively dispersed chromatin rather than as the distinct, condensed chromosome bodies normally recognized in a routine light-microscope image of mitosis.
- G1: the cell grows and prepares the materials needed for DNA replication.
- S: DNA is copied; copying does not require the chromosomes to become visibly condensed.
- G2: the cell prepares for division while its nuclear DNA remains comparatively dispersed.
Check the other groups
A does not describe one consistent visibility state. Chromosomes only begin to decondense during telophase, so separate structures may still be visible while that transition is underway. Cytokinesis can overlap late mitosis and does not by itself specify how condensed the chromosomes are. G0 cells generally have dispersed chromatin, but that does not make all three members of A correct.
C includes M, which contains the chromosome-condensing and chromosome-separating stages of mitosis. D lists mitotic stages with recognizable condensed chromosomes.
“Not visible” means not resolved as separate condensed structures with ordinary light microscopy. It does not mean that DNA disappears or cannot be detected by other imaging methods.
Evidence boundary
This is an adapted version of Pearson cell-biology asset 14081560, preserving its four option groups and their order. It uses the G1/S/G2 interpretation and does not answer the different Gizmo worksheet version. Chromosome visibility depends on preparation, staining, and imaging method; decondensation is gradual, including during telophase. The answer is not a claim that DNA is absent or that only these stages can contain uncondensed chromatin.
Sources
These references support the concepts and methods used in the explanation above.