2-4+Cell+Division.pdf

Recalling from the last lesson 1. State what is active transport and the forms of passive transport 2. State what is passive transport and the forms of active transport Topic 2 – The Cell System 2-4 Cell Division 1. What are the 4 functions of cell division? 2. Which structures in the cell help i...

Recalling from the last lesson 1. State what is active transport and the forms of passive transport 2. State what is passive transport and the forms of active transport Topic 2 – The Cell System 2-4 Cell Division 1. What are the 4 functions of cell division? 2. Which structures in the cell help it to reproduce? Functions of Cell Division Why do cells divide? 1. Repair injured body parts 2. Replace aging cells and cells that die from disease 3. Help organism grow larger 4. Reproduction – asexual reproduction Stages of the Cell Cycle - Overview Stage 1 - Interphase • Cell grows - produces organelles that both daughter cells needs e.g. more chloroplast, ribosomes, mitochondria - makes more enzymes to speed up chemical reactions • Makes a copy of the DNA (replication) - each chromosome contains two identical sets of DNA in the form of chromatids • Prepare for division - in animal cells, a pair of centrioles produced to help with cell division Stage 2 – Mitosis – Prophase • DNA condense to separate chromosomes • Two chromatids making up chromosomes are exact copies of each other • Nuclear membrane breaks apart Stage 2 – Mitosis – Metaphase • Chromosomes line up along center of the cell • Chromatids are side by side Stage 2 – Mitosis – Anaphase • Fibers of the centrioles pull the chromatids apart into each side of the cell Stage 2 – Mitosis – Telophase • Chromatids are at opposite ends and the nuclear membrane reforms around the DNA • Two new nuclei created. • Each nucleus contains a complete, identical copy of DNA. Stage 3 - Cytokinesis • Cell’s cytoplasm divides • Organelles redistributed into each of the two new daughter cells After this, each cell undergoes interphase and the cell cycle begins again In animal cells ~ Cytoplasm squeezes together around middle of cell. Cytoplasm pinches into two cells. In plant cells ~ Cell wall cannot squeeze and pinch. A cell plate will form across middle of the cell which will form new cell membrane between the daughter cells. New cell walls will then form. Video on Cell Division Mitosis Link Rip Out pg 90 to 97 (7A & B Due 10/16) Do Pg 91: Reading check Pg 93: Math Toolbox Pg 95: Reading check, scrambled Mitosis Pg 96: Reading check, Question it Pg 97: Lesson 4 check