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) G1 = the growth phase, a new cell grows to mature size S = DNA is copied or synthesized to prepare for division 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. Prophase Metaphase Anaphase 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 Phases 3. 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