cell reproduction part 2
TRANSCRIPT
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Notes: Life of a Cell
Part 2: Cell Reproduction
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Cell Reproduction
• According to the CELL THEORY, all CELLS come from PREEXISTING cells and have the capability of reproducing
• Life is based on the reproduction of cells or “CELL DIVISION”
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I. What is Cell Division?
• PRODUCTION of DAUGHTER cells
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II. What will happen because of cell division?• GROWTH and DEVELOPMENT: because
of an increase in cell number, cell size, and cell products, the organism grows in stages and shows developmental difference.
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III. Two Types of Cell Division
Asexual Sexual
Set up a table Or tree map in space provided
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Asexual
• Mother cell reproduces 2 IDENTICAL daughter cells
• Example: MITOSIS• Types of cells reproduced: body cells
(somatic)• Happens in both Eukaryotic and
Prokaryotic cells
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Sexual
• After sperm and egg are produced, fusion of these cells produces a non-identical cell
• Example: Meiosis• Types of cells produced: sperm/egg• Only in Eukaryotic cells
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IV. Eukaryotic Cell Division – Up Close
A. The CELL CYCLE: events of the cell that happen before, during, and after cell division
o THREE special events: Interphase (I), Mitosis (M), and Cytokinesis (C)
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1. Interphase (I): 70-90% of cell’s life
• NO active cell division
• 3 phases: G1, S, G2
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Make an Interphase flow map on the bottom of your paper:
Interphase
• 3 Phases
G1
• Growth• Metabolic
processes
S Phase
• DNA copies
G2
• Final growth
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2. Mitosis (PMAT): DIVISION of the cell’s NUCLEUS
• Separation of CHROMOSOMES in a series of processes
• Resulting cell has 2 new NUCLEI• 4 distinct phases: PMAT
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3. Cytokinesis (C): final DIVISION of the Cell’s CYTOPLASM
• 2 new DAUGHTER cells (Identical)• Animal cells pinch or cleave into 2 cells• Plant cells separate as new cell wall divides
the 2 cells
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Mitosis Flow Map: