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Questions and Answers
What is the first phase of the cell cycle?
What is the first phase of the cell cycle?
- G1 (correct)
- S
- G2
- M
How many copies of each chromosome are present at the end of S phase?
How many copies of each chromosome are present at the end of S phase?
- 2
- 3
- 4 (correct)
- 5
What is the last stage of mitosis?
What is the last stage of mitosis?
- Prophase
- Metaphase
- Anaphase
- Telophase (correct)
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Study Notes
- The cell cycle is a series of four phases: G1, S, G2, and M.
- In G1 phase, the cell is diploid and contains two copies of each chromosome.
- In S phase, each chromosome is duplicated and the sister chromatid pairs remain together as a sister chromatid pair.
- At the end of S phase, each homologous chromosome exists as a sister chromatid pair, thus the cell now contains four copies of each chromosome.
- Next, in G2 phase, the two identical chromosomes separate and the cell enters M phase.
- The final phase of the cell cycle is M phase, or mitosis, in which the duplicated chromosomes separate and the cell divides into two daughter cells.
- During mitosis, the spindle apparatus directs the sister chromatids to align in the equatorial plane of the cell.
- Telophase is the last stage of mitosis and ends with cytokinesis, the splitting of the cytoplasmic membrane and cell contents to form two daughter cells.
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