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Why do cells divide? Growth Repair Replace dead cells
What cells divide often? Skin Stomach lining Red Blood cells Embryo Plant roots Hair Nails
What cells rarely/never divide? Nervous System Liver
Why do we age? Eventually cells stop being replaced “Apoptosis” Cell death “We die because out cells die.” William R. Clark
“C” Terms Chromosomes Long threads of genetic material Found in nucleus Chromatid One side of a duplicated chromosome
“C” Terms Centromere Structures that hold sister chromatids together NOTE 2 sister chromatids = 1 duplicated chromosome
“C” Terms Chromatin DNA tnagled around a histone (a protein) Condensed chromatin = chromosome
Huh? B. Chromatin A. DNA histone C. Duplicated chromosome
“C” Terms Centrioles Small protein bodies In cytoplasm Animal cells only
Cell Division in a Nutshell Before: Chromosome duplicates = 2 sister chromatids During: Sister chromatids separate After: 2 “daughter” cells Genetically identical
Cell Cycle Mitotic phase 10% Interphase 90%
Interphase Made up of three phases: G 1, S, G 2 What happens? Things necessary to divide
Interphase G 1 Phase Cell Growth 8-10 hours S Phase DNA replication Chromosome replication 6-8 hours G 2 Phase More Cell Growth Centriole replication 4-6 hours
Mitotic Phase Mitosis Division of nucleus (chromosomes) Occurs after interphase Cytokinesis Division of cytoplasm Creates 2 daughter cells Occurs at the end of mitosis
Mitosis Phases Interphase Prophase Prometaphase Metaphase Anaphase Telophase
Task Draw a diagram of mitosis Label 6 phases & give each a short description
Interphase “Resting Phase” Cell NOT dividing Precedes mitosis Prepares cell for division How?
Early Prophase Centrioles: Make spindle fibres Move towards opposite plates Chromosomes now visible
Late Prophase Centrioles reach poles Nuclear membrane (envelope) & nucleolus start to disappear
Metaphase Spindle fibres attach to centromeres Duplicate chromosomes line up at equator Guided by spindle fibers
Anaphase Spindle fibers retract Pull sister chromatids apart Towards opposite polls
Telophase Chromatin reappears Nuclear membrane & nucleolus reappear Cytokinesis occurs Result Two daughter cells
What phases do you see? A D B C
Cytokinesis Why would it occur differently in animal and plant cells? Plant cells have a rigid cell wall!
Cytokinesis Animal Cells Plant Cells Cell membrane pinches inward Creates cleavagefurrow Think: Pull a string around a balloon Cell Plate forms between two new nuclei Becomes cell wall
Plant vs. Animal – Another Difference? Centrioles not present in plant cells What makes spindle fibers in plant cells? Form from cytoskeleton
The cell cycle and mitosis. Cells constantly reproduce exact duplicates of themselves. Why? Replacement Repair Growth.
Cell Cycle: M Phase Mitosis and Cytokinesis. Cell Division (M phase) Occurs in two stages – Mitosis (nuclear division) – Cytokinesis (cytoplasmic division)
Phases of Cell Division Interphase (stage between cell division) Interphase (stage between cell division) Prophase Prophase Metaphase Metaphase Anaphase.
Mitosis and Cytokinesis B-2.6 Summarize the characteristics of the cell cycle: interphase (called G1, S, G2); the phases of mitosis (called prophase, metaphase,
Mitosis & Cytokinesis Cell Growth and Reproduction Ch. 8.2.
Cell Growth and Division Honors Biology Chapter 10.
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.
Cell Division and Mitosis -Chapter 9- Honors Biology Program Mountain Pointe High School.
Cell Growth and Reproduction. Limitations on Cell Size Diffusion Larger the cell, the longer it takes to get nutrients from outside the cell through diffusion.
M phase. DNA at different phases chromatin chromosome histone nucleosome.
Cell Division Mitosis Chapter 10. Why do cells divide, rather than continually grow forever? The larger a cell becomes, the more demands the cell places.
Cell Cycle IPMATC. Cell Cycle 3 Parts: – Interphase – Mitosis Prophase Metaphase Anaphase Telophase – Cytokinesis.
Cell Cycle Vocabulary and Notes Biology. Centrioles – one of two tiny structures located in the cytoplasm of animal cells near the nuclear envelope. Chromatid.
The Cell Cycle. Chromosomes Carry genetic information in eukaryotes Carry genetic information in eukaryotes Made of DNA and proteins Made of DNA and proteins.
AP Biology Biology is the only subject in which multiplication is the same thing as division…
The Cell Cycle Mitosis. The Cell Cycle The regular sequence of growth and division that cells undergo.
Cell Division. Two Parts of Cell Division (1) Mitosis – (2) Cytokinesis.
Mitotic Cell Division - Exercise 7 Objectives -Know the stages of the cell cycle. -Know why mitosis is important. -Know what types of cells do mitotic.
Cell Growth & Division Question: Why do cells divide? Cell Growth & Division Question: Why do cells divide?
Biology AHSGE Standard VI- Mitosis and Meiosis. Biology AHSGE CONTENT STANDARD 6. Describe the roles of mitotic and meiotic divisions during reproduction,
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 4.8 Mitosis maintains the chromosome number of the parent.
Cell Cycle Cell Growth and Division. 2. Why do cells divide? If the cell is too big: If the cell is too big: Too much demand is placed DNA Too much demand.
Mitosis: The Dance of the Chromosomes. Once Interphase is done the cell is ready to begin Mitosis. Mitosis is when the cell divides.
Cell Cycle and Mitosis. The Cell Cycle: life of a cell from first formation (from a dividing parent cell) to its own division into 2 cells. Before a.
Cell Cycle and Cell Division CST Review PowerPoint.
Cell Division The Cell Cycle: Interphase Mitosis Cytokinesis.
End Show Slide 1 of 38 Copyright Pearson Prentice Hall Prentice Hall Biology.
Section 10-2 Cell Division Biology I Flora. Two Parts of Cell Division (1) Mitosis – division of the cell nucleus (2) Cytokinesis – Division of the cytoplasm.
Mitosis and the Cell Cycle Cell reproduction. Todays Objectives The student will be able to identify the phases of the cell cycle and mitotic stages by.
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