Summary
Mitosis is the process of nuclear division resulting in two genetically identical daughter nuclei. It consists of four stages: Prophase, Metaphase, Anaphase, and Telophase.
- Prophase — Chromatin condenses, centrosomes move to opposite poles, and spindle fibers form. Example: The nuclear envelope begins to disappear.
- Metaphase — Chromosomes align at the spindle's equator. Example: Microtubules attach to centromeres.
- Anaphase — Chromatids are pulled to opposite poles. Example: Spindle fibers shorten, separating chromatids.
- Telophase — Chromosomes decondense and nuclear envelopes reform. Example: The cell prepares to divide into two.
- Mitotic Index — A measure of cell division rate in a tissue. Example: Calculated by counting cells in mitosis per unit area.
- Stem Cells — Undifferentiated cells that can become specialized. Example: Embryonic stem cells can form any cell type.
Exam Tips
Key Definitions to Remember
- Mitosis
- Prophase
- Metaphase
- Anaphase
- Telophase
- Mitotic Index
- Stem Cells
Common Confusions
- Confusing mitosis with meiosis
- Misunderstanding the sequence of mitosis stages
Typical Exam Questions
- What is the role of spindle fibers in mitosis? They help separate chromatids during Anaphase.
- How is the mitotic index calculated? By counting the number of cells in mitosis per unit area.
- What is the significance of stem cells? They can differentiate into specialized cells for various functions.
What Examiners Usually Test
- Understanding of each mitosis stage
- Ability to identify stages of mitosis in diagrams
- Calculation and interpretation of the mitotic index