9700 · 5.2
Chromosome behaviour in mitosis
Welcome to this lesson on **chromosome behaviour in mitosis**! This fundamental process of cell division is crucial for growth, tissue repair, and asexual reproduction across all eukaryotes. Mastering the intricate dance of **chromosomes** through **prophase, metaphase, anaphase, and telophase** is key to excelling in your Cambridge 9700 Biology exams. Key points align with **A-Level Notes** 9700 Biology chapter **5** (topic **5.2**).
Need to know
What you need to know
- Mitosis produces two genetically identical diploid (2n) daughter cells.
- The four stages are Prophase, Metaphase, Anaphase, and Telophase (PMAT).
- DNA replication occurs during the S phase of Interphase, creating sister chromatids.
- Spindle fibres, made of microtubules, are essential for separating chromosomes.
- Cytokinesis in animal cells involves a cleavage furrow; in plant cells, a cell plate forms.
- Mitosis is vital for growth, tissue repair, and asexual reproduction.
- The cell cycle is regulated by cyclins and CDKs at specific checkpoints.
- Loss of cell cycle control due to genetic mutations can lead to cancer.
Explanation
Chromosome behaviour in mitosis
- Mitosis produces two genetically identical diploid (2n) daughter cells.
- The four stages are Prophase, Metaphase, Anaphase, and Telophase (PMAT).
- DNA replication occurs during the S phase of Interphase, creating sister chromatids.
- Spindle fibres, made of microtubules, are essential for separating chromosomes.