6-2 NOTES: MITOSIS AND CELL CYCLE. DIVISION IN EUKARYOTES Two types of Cell Division for eukaryotes:...
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Transcript of 6-2 NOTES: MITOSIS AND CELL CYCLE. DIVISION IN EUKARYOTES Two types of Cell Division for eukaryotes:...
6-2 NOTES: MITOSIS AND CELL CYCLE
DIVISION IN EUKARYOTES
Two types of Cell Division for eukaryotes:Mitosis and Meiosis
MITOSIS (DIVISION OF THE NUCLEUS) Occurs in organisms undergoing
growth, development, and repair One cell division Makes 2 new cells identical to the original
cell Makes somatic cells Makes diploid cell (2n)
MEIOSIS
Meiosis (gamete production) = Occurs during the reproduction of gametes (sex cells) Two cell divisions makes 4 new cells with half the
genetic material of the original Makes sex cells Makes haploid cells (n)
CELL CYCLE
Cell Cycle = A repeating cycle of events in the life of a cell
CELL CYCLE
Interphase = the period between cell divisions (made of 3 phases)
CELL CYCLE
Interphase = the period between cell divisions (made of 3 phases)
1) G1 = the growth phase, a new cell grows to mature size
2) S = DNA is copied or synthesized to prepare for division
3) G2 = the time when the cell prepares for division
CELL CYCLE
Optional**) G0 = following G1 a cell can exit the cell cycle and prevent further cell division
• Ex/ Developed nerve cells enter G0 so nerve cells can not divide to repair damage
MITOSIS PHASES
Mitosis divides the cell’s nucleus in four phases.
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
MITOSIS PHASES
1. Prophase: Chromosomes condense, nucleus breaks down, and spindle fibers form
MITOSIS PHASES
2. Metaphase: Chromosomes line up in the middle of the cell
MITOSIS PHASES3. Anaphase: sister chromatids separate to
opposite sides of the cell.
MITOSIS PHASES
4. Telophase: The new nuclei form, spindle fibers break down, and chromosomes begin to uncoil.
MITOSIS PHASES
Cytokinesis: division of the cytoplasm
SEQUENCE OF CELL CYCLE
G1 S G2 M (Mitosis) C (Cytokinesis)
INTERPHASE CELL DIVISION
https://www.youtube.com/watch?v=aDAw2Zg4IgE
CELL CYCLE BRACE MAP
CLASSWORK
Cell Cycle Drawing pg 155
• Draw and label each phase
Mitosis Flipbook use page 156
• Name each phase• Draw and label cells at each cell• Describe each phase