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CELL DIVISION © 2006 Mesoblast Limited © 2007 Paul Billiet ODWSODWS
Cell division is a fundamental process All cells come from pre-existing cells It is necessary to replace worn out cells in multicellular organisms It is required for growth in multicellular organisms An increase in size will require an increase in surface area to volume ration Cell division subdivides the cytoplasm into small units (cells) surrounded by plasma membranes It is necessary for reproduction in unicellular or multicellular organisms © 2007 Paul Billiet ODWSODWS
Cell division and reproduction It is necessary for reproduction in unicellular or multicellular organisms Microbus © Microscope-Microscope.orgMicroscope-Microscope.org © 2007 Paul Billiet ODWSODWS
Prokaryotes Prokaryotes have no nucleus They have a single circular chromosome Prokaryotes simply divide their cells in two by binary fission © 2007 Paul Billiet ODWSODWS
Eukaryotes Eukaryotes must divide their nucleus (and other organelles such as mitochondria) in preparation for cell division (mitosis or meiosis) Before the nucleus divides the genetic material replicates (duplicates) © 2007 Paul Billiet ODWSODWS
Mitosis Mitotic division results in genetically identical eukaryotic cells (a clone) Mitosis is the basis of asexual reproduction © Tyler Junior College, (no commercial use allowed - contact for permission to use) © 2007 Paul Billiet ODWSODWS
Meiosis Meiosis results in a halving of the chromosome number in preparation for fertilisation Meiosis shuffles genes in new combinations Meiosis results in genetically different cells Meiosis and fertilisation are the basis of sexual reproduction © 2007 Paul Billiet ODWSODWS
COMPARING MITOSIS AND MEIOSIS © 2007 Paul Billiet ODWSODWS
COMPARING MITOSIS AND MEIOSIS © 2007 Paul Billiet ODWSODWS
Meiosis and Reproduction. Types of Reproduction Asexual Reproduction – production of offspring that requires only one parent; all the genetic materials.
Cell Growth and Division Mitosis and Meiosis. Cell Growth When an organism grows, the number of cells increase but the size of each cell remains small.
SC.912.L Compare and contrast mitosis and meiosis and relate to the processes of sexual and asexual reproduction and their consequences for genetic.
Cell Reproduction Prokaryotes Bacteria Eukaryotes Plants & animals copyright cmassengale.
Notes E 4.3 Meiosis is a special form of cell division.
Cell Division page 95 Define Cell Cycle--- the regular sequence of growth and division happens again and again---cycle allows you to grow and repair your.
WHEN/WHY DO CELLS DIVIDE?. BIGGER IS NOT BETTER! IMPORTANCE OF CELL MEMBRANE IMPORTANCE OF CELL MEMBRANE –Controls what goes into/out of a cell –All cells.
Discovery of Cells. First to View Cells In 1665, Robert Hooke used a microscope to examine a thin slice of cork What he saw looked like small boxes so.
Prokaryote ◦ No nucleus ◦ Unicellular ◦ Example: Bacteria Eukaryote ◦ Nucleus ◦ Complex organelles ◦ Uni or multicellular ◦ Example: Us!
Cell Cycle & Mitosis. 2 Cell Division All cells are derived from pre- existing cells All cells are derived from pre- existing cells New cells are produced.
Cells & Heredity: Chapter 3 Sections 3-1 and 3-3.
Protists Chapter 8, Section 1. What is a Protist? One or many celled eukaryotic organism that lives in moist or wet surroundings. Remember, a eukaryotic.
Note for C 1.1: Single-celled organisms have all the characteristics of living things.
Chapter 3: Cell Division 3.1 Cell division occurs in all organisms 3.2 Cell division is part of the cell cycle 4.3 Meiosis is a special form of cell division.
Mitosis vs. Meiosis. Meiosis Mitosis Based on the diagram, The difference between mitosis and meiosis is that mitosis produces two identical daughter.
CELLS AND HEREDITY. Introduction November 30, 2010 New Vocabulary List – back of spiral –Title of new list – Heredity –DNA -- a molecule found in cells.
Anticipation Guide Observe the pictures on the next slide and in front of you….. Put the pictures in the correct order….or the order you think they should.
Eukaryotic and Prokaryotic Cells Prokaryote = without a nucleus Eukaryote = with a nucleus.
The Cell Cycle Mitosis and Meiosis IB
The Cell in Action Guided Notes. What you should already know… Cell membrane – a phospholipid layer that covers a cells surface; acts as a barrier between.
Are all cells alike?. All organisms are made of cells The cell is the basic unit of structure & function The cell is the smallest unit that can still.
BIOLOGY Topic 1. Topic Outline Cell Theory Cell Theory Prokaryotic Cells Prokaryotic Cells Eukaryotic Cells Eukaryotic Cells Membranes Cell Division Cell.
Basic Cell Structure. Cells Basic building blocks of life Understanding of cell morphology is critical to the study of biotechnology.
What does it mean to be a cell?. The answer to this question started to unfold more than 300 years ago. The newly invented microscope was used to examine.
Continuity and variety Lectures by Mark Manteuffel, St. Louis Community College; Clicker Questions by Kristen Curran, University of Wisconsin-Whitewater.
DNA Protein Synthesis Replication. DNA carries a code for proteins.
Chapter 8: Cell Reproduction. Review OrganellesCentrioles Made of microtubules Acts as anchors in cell division Mitotic Spindle fibers Two Main types.
AQA Biology AS Level Unit 2 Meiosis, Mitosis and the Cell Cycle.
Inquiry into Life Twelfth Edition Chapter 5 Lecture PowerPoint to accompany Sylvia S. Mader Copyright © The McGraw-Hill Companies, Inc. Permission required.
Cells Mini Assessment Review. DNA: Is the genetic material found in cells. DNA stands for deoxyribonucleic acid.
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