Put the following events of the cell cycle in order. (The first event will be 1, the second will be 2, and so on...) DNA is replicated. Chromosomes condense, mitotic spindle forms... Put the following events of the cell cycle in order. (The first event will be 1, the second will be 2, and so on...) DNA is replicated. Chromosomes condense, mitotic spindle forms, nuclear envelope breaks down, sister chromatids attach to the spindle. Sister chromatids line up along the equator of the cell. Sister chromatids split at the centromere and move to opposite poles of the cell. Chromosomes reach opposite poles and de-condense, nuclear envelopes reform, spindle is broken down.
Understand the Problem
The question asks to order the events of the cell cycle. This requires knowledge of the different phases and the order in which they occur during cell division.
Answer
1. DNA replication, 2. Chromosome condensation, 3. Alignment of sister chromatids, 4. Sister chromatid separation, 5. chromosome de-condensation.
- DNA is replicated.
- Chromosomes condense, mitotic spindle forms, nuclear envelope breaks down, sister chromatids attach to the spindle.
- Sister chromatids line up along the equator of the cell.
- Sister chromatids split at the centromere and move to opposite poles of the cell.
- Chromosomes reach opposite poles and de-condense, nuclear envelopes reform, spindle is broken down.
Answer for screen readers
- DNA is replicated.
- Chromosomes condense, mitotic spindle forms, nuclear envelope breaks down, sister chromatids attach to the spindle.
- Sister chromatids line up along the equator of the cell.
- Sister chromatids split at the centromere and move to opposite poles of the cell.
- Chromosomes reach opposite poles and de-condense, nuclear envelopes reform, spindle is broken down.
More Information
The order of events describes the key steps in the cell cycle, specifically focusing on DNA replication and the phases of mitosis (prophase, metaphase, anaphase, and telophase).
Tips
A common mistake is confusing the order of metaphase and anaphase. Metaphase involves the alignment of sister chromatids, while anaphase is when they separate.
Sources
- 6.2 The Cell Cycle – Concepts of Biology – 1st Canadian Edition - opentextbc.ca
- Phases of mitosis | Mitosis | Biology (article) - Khan Academy - khanacademy.org
- The cell cycle, mitosis and meiosis for higher education - le.ac.uk
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