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