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Cell Growth and Division
Cell Growth Living things grow chiefly because of two things. 1. The number of cells increases.
2. The size of each individual cell increases. Number 1 is actually due to number 2!
Volume vs. Area The volume, the growth of the internal parts of the cell surpasses that of the area, or external parts of the cell.
Limits The growth is limited by two things The instructions, DNA. The amount of available materials.
Cell division The point at which the internal exceeds the external = division. Parent Daughter 1 Daughter 2
Rate of growth In ideal conditions, E- coli can double its volume in just 30 minutes. In one day a single bacteria could produce a 14 Kg mass.
In three days the mass of the bacteria would equal that of the…
Disorderly growth Cancer: a disorder in which cells have lost the ability to control their rate of growth. P D1 D2 D3 D2 D3 D1 D2 D3 D2 D3
Cell Division There are two main stages to division of Eukaryotic cells. Mitosis Cytokinesis
Mitosis The nucleus of the parent cell is divided into 2. Each with the same number and type of chromosomes.
Cytokinesis The cytoplasm of the parent cell divides. Two distinct cells are formed. Daughter cells
Chromosomes Highly organized segments of genetic information. Made up of chromatin.
Chromatin A specific combination of DNA and proteins.
Chromatids Each chromosome has two identical parts, chromatids. Joined by a centromere.
The two identical parts allow for the production of two identical cells.
The process of cell growth and division is a cycle. Mitosis Cytokinesis Interphase
Mitosis Cytokinesis Interphase
The period between cell divisions 3 phases G1, S, and G2
1.G1: Cell growth 2.S: DNA replication 3.G2: Preparation for mitosis
Mitosis (4 phases) 1.Prophase 2.Metaphase 3.Anaphase 4.Telophase
Prophase(fig 8-12) Longest phase Centrioles take positions at opposite ends of the cell
Spindle fibers form between the centrioles Chromosomes attach to the spindle
The nucleolus disappears The nuclear envelope breaks down.
Metaphase(fig 8-14) Shortest phase Chromosomes line up along the center of the cell.
Anaphase (fig 8-15) Centromeres split Individual chromatids are pulled to opposite ends of the cell.
Telophase (fig 8-16) Final phase Chromatids uncoil to reveal a mass of chromatin.
Nuclear envelopes reform around the chromatin A nucleolus becomes visible for each daughter cell
Cytokinesis Animal Cells The cell membrane moves inward pinching the cytoplasm into two cells.
Each half contains a nucleus And all necessary organelles Plant Cells A cell plate forms dividing the cell in half
The cell plate evolves into a new cell wall for each cell.
Scientific Notation M X 10 n A.1.) 1.0 X 10 -8 cm A.2.) 1.0 X 10 10 cm B.1.) 0.000002 cm B.2.) 1,000,000 times greater
3/6/2016 Cell Division Cell divides into two daughter cells.
The Cell Cycle & Cell Division. The Cell Cycle
Mitosis Cells must divide in order to create new cells. This is more complicated in eukaryotic cells because there are so many organelles. Bacteria can.
Youtube links to watch ZIfKlMhttp://www.youtube.com/watch?v=gwcwS ZIfKlM WjHQ4http://www.youtube.com/watch?v=lpAa4T.
Lesson Overview Lesson Overview The Process of Cell Division Lesson Overview 10.2 The Process of Cell Division.
Cell Division The Cell Cycle and Mitosis. Why do cells divide? Growth Repair Reproduction.
Cell Division The Cell Cycle and Mitosis. Why do cells divide? Growth Reproduction Repair.
10-2 Cell division. 2 phases of cell division Mitosis: division of the cell nucleus, including DNA replication. Mitosis: division of the cell nucleus,
CHAPTER 10.2 Cell Division. A cell has to go through many preparations to divide. This is important to make sure that each new cell has all the necessary.
CELL CYCLE How many cells do we begin with? 2 How do we get more?
Section 10.2 (Pg ): The Process of Cell Division.
The Cell Cycle. Steps in the cell cycle Interphase: No division occurs. Interphase has three subdivisions: G1 SS G2.
The Cell Cycle. Chromosomes Carry genetic information in eukaryotes Carry genetic information in eukaryotes Made of DNA and proteins Made of DNA and proteins.
SC- B-2.6: Summarize the characteristics of the cell cycle: interphase;the phases of mitosis, and plant & animal cytokinesis.
What do they do? Stages What’s Going on? What is It?
MITOSIS. Animated Cycle
10 – 2 Cell Division Mitosis. Chromosomes DNA is passed on in chromosomes DNA is passed on in chromosomes Every organism has a specific # of chromosomes:
Cell Cycle IPMATC. Cell Cycle 3 Parts: – Interphase – Mitosis Prophase Metaphase Anaphase Telophase – Cytokinesis.
Stages of Mitosis What’s happening and where are things moving to?
Activity #44 PHASES OF THE CELL CYCLE. 6 Phases of the Cell Cycle 1.Interphase 2.Prophase 3.Metaphase 4.Anaphase 5.Telophase 6.Cytokinesis.
Lesson Overview 10.2 The Process of Cell Division.
The Cell Cycle Start G S G Mitosis.
Bell Ringer: No paper needed Why do cells divide?.
Mitosis and Cytokinesis The cell cycle is a repeated pattern of growth and division that occurs in eukaryotic cells. This cycle consists of three phases:
MITOSIS the key to growth. Mitosis - the division of the nucleus into two equal sets of genetic information Basically, simple cell division.
The Cell Cycle The cell cycle includes the process in which single cells divide to form TWO identical cells with the SAME number of chromosomes.
Mitosis and Cytokinesis KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.
Cell Division Mitosis. Chromosomes Eukaryotes Found in the nucleus Contain most of the genes Made up of two sister chromatids, joined by a centromere.
1 Review What are chromosomes Compare and Contrast How does the structure of chromosomes differ in prokaryotes and eukaryotes 2 Review What happens during.
Cell Cycle Notes Chapter 8. Division of the Cell Cell division forms two identical “daughter” cells. Before cell division occurs, the cell replicates.
Mitosis and the Cell Cycle Division of the nucleus and the nuclear material (DNA), as well as the cell.
How do cells grow & reproduce?. In the Beginning – One Cell Most of the organisms start out as one cell Humans start out as a single cell, the zygote,
Cell Division. Why do we grow? Do our cells get bigger? NO: organisms grow because they produce more cells, not larger ones. A baby’s cells are the same.
The Cell Cycle. INTERPHASE : G 1 - cell growth, the longest part of the cell’s life S – DNA synthesis, DNA is copied (replication) G 2 – cell prepares.
The Cell Cycle the amazing! incredible! I-can’t –wait-to- hear-more story of how cells divide.
Chapter 3 Lesson 1 The Cell Cycle and Cell Division.
How Cells Make More Cells The CELL CYCLE is the process by which cells divide to make new cells. There are three main stages to this cycle. They are: 1.Interphase.
Cell Cycle The repeating set of events in the life of a cell. The repeating set of events in the life of a cell. Includes Includes Interphase Interphase.
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,
Cell Division B-2.6 Summarize the characteristics of the cell cycle: interphase (called G1, S, G2); the phases of mitosis (called prophase, metaphase,
Cell Division. Two Parts of Cell Division (1) Mitosis – (2) Cytokinesis.
The Cell Cycle: Interphase, Mitosis and Cytokinesis Gridlock Rules.
Cell Division Ch. 10. Why do cells divide? (1) Exchanging materials The larger a cell becomes, the harder it is to get enough materials and waste across.
CELL DIVISION Mitosis. WHAT IS MITOSIS? Part of eukaryotic cell division during which the cell nucleus divides. Results in the formation of 2 identical.
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