Cell Growth and Reproduction -...
Transcript of Cell Growth and Reproduction -...
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Cell Growth and Reproduction
Page 201
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Describe cells that make up a multicellular organisms…
Comes in wide variety of shapes and sizes
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Name the cell with the largestdiameter.
Yolk of an ostrich egg
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Name the diameter range of most living cells.
2 to 200 ųm (micrometers)
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Factors that Cause Cell Size Limitations
Why can’t most organisms be just onegiant cell?
Diffusion would be
rapidDiffusion
would start to slow down
Diffusion would be
extremely slow
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Name the organelle where DNA (blueprint) is located.
Inside nucleus of the cell.
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Explain how DNA limits cell size? Need to understand…
DNA is copied at a certain rate. If this rate slows down, less DNA is copied.
Therefore...
Cells cannot survive when there is notenough DNA to support original protein function.
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If a certain number of DNA is required, how then do larger cells
such as amoeba survive?
Needs manynuclei in order to produce enough DNA.
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Surface Area to Volume Ratio
SA: LxWx6(1mm) SA: LxWx6
SA: 6mm2 (2mm) SA: LxWx6 SA: 24mm2 (4mm)
SA: 96mm2
Volume: LxWxH Volume: LxWxH Volume: LxWxH(1mm) (2mm) (4mm)
Volume = 1mm3 Volume = 8mm3 Volume = 64mm3
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Surface Area to Volume Ratio
Surface area is increasing slower by 4 times.
Volume is increasing faster by 8 times Not enough surface area to allow
nutrients and waste to diffuse through Cell would eventually starve and die
Therefore, cells divide before they become too large to function.
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Cell Reproduction Recall: List the 3 parts of the “cell
theory”.
1.) All living things are made up of 1 or more cells.
2.) Cells come from other pre-existing cells.
3.) Cells are the basic unit and structure of life.
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Cell Reproduction
Cell division results in two cells that are identical to the original parent cell.
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Cell Reproduction Why does cell division occur in our
bodies?
To replace worn out cells/tissues To grow To replace dying cells To help heel cuts and bruises To help with digestion
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Define Chromosomes. Chromosomes are dark colored
structures that contain DNA in the nucleus.
Carriers genetic material of living things.
The Greek words…chroma…meaning colored
soma…meaning body
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Vocabulary
Karyotype is a photomicrographpicture of chromosomes
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Vocabulary (draw in upper left of box)ChromosomeSingle DNA
molecule with proteins
Rod in shape
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Vocabulary (draw in upper right of box)
CentromereHolds the 2 sister chromatidstogether
Sister chromatids½ of a chromosome2 chromatids
makes up 1 whole chromosome.
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How many chromatids are there?
How many chromosomesare there?
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Vocabulary (bottom picture)
Protein called histones. Beads that allow DNA to coil up tightly
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Define cell cycle.
The cell cycle is the sequence of growth and division of a cell
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How many periods are in the cell cycle. Name them.
Growth Division of a cell
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Name the phase where the majority of a cell’s life is spent.
InterphaseWhere cell spends 90% of cell cycle
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Name the 4 events that occur in this phase of a cell cycle.
1.) Growth2.) DNA Replication3.) Carries out metabolic activities4.) Prepares for cell division
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Name and define phase 2 that follows after phase 1, Interphase.
Mitosis
Process by which 2 daughters cells are formed each containing identicalchromosomes.
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Name and define phase 3 that follows after phase 2, Mitosis.
Cytokinesis
When either the cell membrane or cellwall reforms in order to separate the cells into two.
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The Cell Cycle
Phase 2:Mitosis
Phase 3:Cytokinesis
Growth & Metabolic Activities
DNA Copies
PreparesForCell
division
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The Phases of Mitosis Visible chromosomes
cannot be seenDNA replicating
(copying)Cell is growing Longest part of the
cell cycle (90%) Pre-stage before
actual mitosis begins
Phase 1: Interphase
Nucleus
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The Phases of Mitosis
Nuclear membrane begins to break down
Chromosomes pair up and startbecoming visible
Phase 2: Prophase
Nuclear Membrane
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The Phases of Mitosis Chromosomes line up
vertically at the metaphase plate (equator)
Spindles (fishing line) form and attach to chromosomes
Centrioles form (boxes). Acts as reel of fishing rod or like magnets.
Phase 3: Metaphase
Means “middle”
Spindles
Centriole
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The Phases of Mitosis
Chromosomes split apartSister chromatidsmove to oppositesides of centrioles(poles)Spindles shorten to
reel sister chromatids in
Phase 4: Anaphase
Centriole
Spindle
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The Phases of Mitosis Nuclear membrane
reformsChromosomes
straighten outPlant Cell: cell wall
formsAnimal Cell: cell
membrane closes inward and pinches off to make 2 identical cells(cytokinesis)
Phase 5: Telophase
Two cells
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Formula for Mitosis
n = number of chromosomes present
2n
2n
2nParent
Daughters Cells
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Results of Mitosis (Organization Level)
Cells Tissues
Organs Organs Systems
Organisms