Cell Cycle Notes Mitosis Definition Mitosis is the
- Slides: 15
Cell Cycle Notes
Mitosis Definition Mitosis is the process in which a eukaryotic cell separates the chromosomes in its cell nucleus, into two identical sets in two daughter nuclei.
Why must cells divide? Growth – bigger organisms need more cells (You, yes you, started as ONE cell!) Repair – regeneration of skin, blood, bone, etc. Reproduction – sexual vs asexual
Mitosis • Cell Division occurs in a series of stages or phases. – Interphase – Prophase – Metaphase – Anaphase – Telophase – Cytokinesis
The Cell Cycle Interphase – cell spends 90% of its time here G 1 – growth phase one S – synthesis phase G 2 – growth phase two Mitosis Prophase Metaphase Anaphase Telophase Cytokinesis Division of cell into 2 new cells with identical DNA
Mitosis
Interphase 1. Growth 1 (G 1) 1. 2. 3. Growth of cell organelles, chromosomes are stretched out and actively giving directions for proteins Synthesis (S) 1. Chromosomes are replicated and condensed (# doubles) – each chromosome appears as a threadlike coil (chromatin) 2. Copy is called sister chromosome 3. Sister chromosomes change to sister chormatids at the end of the phase. Growth 2 (G 2) 1. Final growth phase, cell makes sure there are enough organelles for each new cell to split during cytokinesis
A bit about chromosome terminology. . . Sister Chromatids
Prophase (This is the OFFICIAL start of “MITOSIS”) Chromosomes condense very tightly and are now visible. Centrioles (or poles) appear and begin to move to opposite ends of the cell Spindle fibers form between the poles Nuclear envelope breaks down
Metaphase Chromatids (pairs of chromosomes) line up in middle of cell across “equator” Centromere (holds sisters together) attaches to spindle fiber
Anaphase Centromere divides (sister chromatids separate) Spindle fibers pull chromatids apart Chromosomes move to opposite sides of cell
Telophase Kind of the reverse of Prophase Two new nuclei form Nuclear envelope reforms Chromosomes uncoil Chromosomes appears as chromatin (threads rather than rods) Spindle fibers break down Mitosis Ends
Cytokinesis Separation of the cytoplasm Cell membrane moves inward to create two daughter cells Each has its own nucleus and identical chromosomes A little bit different in plants than animals
Result of Mitosis Two new cells with identical DNA (cell directions).
The Cell Cycle Review Interphase – cell spends 90% of its time here G 1 – growth phase one S – synthesis phase G 2 – growth phase two Mitosis Prophase Metaphase Anaphase Telophase Cytokinesis Division of cell into 2 new cells with identical DNA
- Mitosis and cell cycle terminology
- Concept mapping mitosis and meiosis
- Phases of cell cycle
- Events of the cell cycle
- Cell cycle and cell division
- Biology.arizona.edu/cell bio/activities/cell cycle/01.html
- Handwriting คือ
- Meiosis
- 2 mon
- Mitosis number of cell divisions
- Mitosis and meiosis
- Crossing over in meiosis and mitosis
- Cell mitosis
- Interphase
- Two cells are produced
- Mitosis cytokinesis