notes: mitosis and cell cycle
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Notes: Mitosis and Cell Cycle. Division in Eukaryotes. Two types of Cell Division for eukaryotes: Mitosis and Meiosis. Division in Eukaryotes. Mitosis (division of the nucleus) Occurs in organisms undergoing growth, development, and repair. Division in Eukaryotes. - PowerPoint PPT PresentationTRANSCRIPT
6-2 NOTES: MITOSIS AND CELL CYCLE
DIVISION IN EUKARYOTESTwo 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)
MEIOSISMeiosis (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 CYCLECell Cycle = A repeating cycle of events in the life of a cell
CELL CYCLEInterphase = the period between cell divisions (made of 3 phases)
CELL CYCLEInterphase = 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 CYCLEOptional**) 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 PHASESMitosis divides the cell’s nucleus in four phases.
1. Prophase2. Metaphase3. Anaphase4. Telophase
MITOSIS PHASES1. Prophase: Chromosomes condense, nucleus breaks down, and spindle fibers form
MITOSIS PHASES2. Metaphase: Chromosomes line up in the middle of the cell
MITOSIS PHASES3. Anaphase: sister chromatids separate to
opposite sides of the cell.
MITOSIS PHASES4. Telophase: The new nuclei form, spindle fibers
break down, and chromosomes begin to uncoil.
MITOSIS PHASESCytokinesis: division of the cytoplasm
SEQUENCE OF CELL CYCLEG1 S G2 M (Mitosis) C (Cytokinesis)INTERPHASE CELL DIVISION
https://www.youtube.com/watch?v=aDAw2Zg4IgE
CELL CYCLE BRACE MAP
CLASSWORKCell 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