Question at position 15 G1, S, and G2 are all part ofsexual reproductioninterphasemitosismeiosisClear my selectionSingle choice
A
sexual reproduction
B
interphase
C
mitosis
D
meiosis

Question

Question at position 15 G1, S, and G2 are all part ofsexual reproductioninterphasemitosismeiosisClear my selection

BlackTom AI · Accepted Answer

1) Relevant knowledge points and concepts
G1, S, and G2 are named subphases of the cell cycle. Together they form interphase, the period when a cell grows, performs normal functions, and duplicates its DNA before cell division. Interphase is distinct from the mitotic (M) phase, when the cell actually divides. Meiosis is a specialized form of cell division producing gametes, and "sexual reproduction" is a broader biological process that may involve meiosis and fertilization, not a cell-cycle substage.

2) Step-by-step reasoning
- The cell cycle consists of: G1 (first gap), S (synthesis), G2 (second gap), and M (mitosis or meiosis in reproductive cells).
- In G1 the cell increases in size and synthesizes proteins and organelles.
- In S phase the cell replicates its DNA so each daughter cell will receive a complete genome.
- In G2 the cell continues growth, checks for DNA damage, and prepares mitotic machinery.
- These three phases (G1, S, G2) occur consecutively and are collectively called interphase because the cell is not undergoing mitotic chromosome segregation during them.

3) Calculations / intermediate steps
No numerical calculations are required here. The logical intermediate steps are the identification of each subphase and their order (G1 → S → G2), confirming they are parts of the same broader stage, interphase.

4) Why the correct answer is correct
Interphase precisely names the combined period made up of G1, S, and G2. The defining criterion is that DNA replication (S) and growth phases (G1 and G2) all occur before the division events of M phase. Therefore G1, S, and G2 are interphase components.

5) Why the other options are incorrect
- Sexual reproduction: a whole-organism process, not the name of cell-cycle subphases.
- Mitosis: refers to the actual process of nuclear and cytoplasmic division (M phase), not G1/S/G2.
- Meiosis: a specialized division that includes its own prophase/metaphase/anaphase/telophase events; G1/S/G2 are still interphase components preceding meiosis but the term meiosis does not label those three phases.

6) Conclusion
G1, S, and G2 are parts of interphase. This matches the provided correct answer: interphase.

Question at position 15 G1, S, and G2 are all part ofsexual reproductioninterphasemitosismeiosisClear my selectionSingle choice

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